620159409 has 15 divisors (see below), whose sum is σ = 926745897. Its totient is φ = 413290188.

The previous prime is 620159347. The next prime is 620159429. The reversal of 620159409 is 904951026.

The square root of 620159409 is 24903.

It is a perfect power (a square), and thus also a powerful number.

620159409 is a `hidden beast` number, since 62 + 0 + 1 + 594 + 0 + 9 = 666.

It is not a de Polignac number, because 620159409 - 2⁹ = 620158897 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (620159429) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 222744 + ... + 225510.

Almost surely, 2^620159409 is an apocalyptic number.

620159409 is the 24903-rd square number.

620159409 is the 12452-nd centered octagonal number.

It is an amenable number.

620159409 is a deficient number, since it is larger than the sum of its proper divisors (306586488).

620159409 is an frugal number, since it uses more digits than its factorization.

620159409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5546 (or 2770 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The cubic root of 620159409 is about 852.7749718276.

Multiplying 620159409 by its sum of digits (36), we get a square (22325738724 = 149418²).

The spelling of 620159409 in words is "six hundred twenty million, one hundred fifty-nine thousand, four hundred nine".