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620706131 = 4491382419
BaseRepresentation
bin100100111111110…
…011100101010011
31121020222010201222
4210333303211103
52232400044011
6141331515255
721244625603
oct4477634523
91536863658
10620706131
11299410781
12153a58b2b
139b798546
145c616c03
153975cddb
hex24ff3953

620706131 has 4 divisors (see below), whose sum is σ = 622089000. Its totient is φ = 619323264.

The previous prime is 620706109. The next prime is 620706133. The reversal of 620706131 is 131607026.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131607026 = 265803513.

It is a cyclic number.

It is not a de Polignac number, because 620706131 - 26 = 620706067 is a prime.

It is a super-2 number, since 2×6207061312 = 770552202121978322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 620706131.

It is not an unprimeable number, because it can be changed into a prime (620706133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690761 + ... + 691658.

It is an arithmetic number, because the mean of its divisors is an integer number (155522250).

Almost surely, 2620706131 is an apocalyptic number.

620706131 is a deficient number, since it is larger than the sum of its proper divisors (1382869).

620706131 is a wasteful number, since it uses less digits than its factorization.

620706131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1382868.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 620706131 is about 24913.9746126546. The cubic root of 620706131 is about 853.0254955324.

The spelling of 620706131 in words is "six hundred twenty million, seven hundred six thousand, one hundred thirty-one".

Divisors: 1 449 1382419 620706131