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621147145 = 5197389567
BaseRepresentation
bin100101000001011…
…111010000001001
31121021210112200211
4211001133100021
52233003202040
6141345201121
721251443423
oct4501372011
91537715624
10621147145
11299692053
121540301a1
139b8c11b8
145c6cd813
15397e88ea
hex2505f409

621147145 has 16 divisors (see below), whose sum is σ = 795363840. Its totient is φ = 464310144.

The previous prime is 621147127. The next prime is 621147161. The reversal of 621147145 is 541741126.

It is not a de Polignac number, because 621147145 - 25 = 621147113 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37849 + ... + 51718.

It is an arithmetic number, because the mean of its divisors is an integer number (49710240).

Almost surely, 2621147145 is an apocalyptic number.

It is an amenable number.

621147145 is a deficient number, since it is larger than the sum of its proper divisors (174216695).

621147145 is a wasteful number, since it uses less digits than its factorization.

621147145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89664.

The product of its digits is 6720, while the sum is 31.

The square root of 621147145 is about 24922.8237766109. The cubic root of 621147145 is about 853.2274736269.

The spelling of 621147145 in words is "six hundred twenty-one million, one hundred forty-seven thousand, one hundred forty-five".

Divisors: 1 5 19 73 95 365 1387 6935 89567 447835 1701773 6538391 8508865 32691955 124229429 621147145