625537381 has 6 divisors (see below), whose sum is σ = 727665990. Its totient is φ = 536174856.

The previous prime is 625537351. The next prime is 625537387. The reversal of 625537381 is 183735526.

It can be written as a sum of positive squares in only one way, i.e., 509630625 + 115906756 = 22575^2 + 10766^2 .

It is not a de Polignac number, because 625537381 - 2⁹ = 625536869 is a prime.

It is a super-2 number, since 2×625537381² = 782594030056678322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625537387) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6382986 + ... + 6383083.

It is an arithmetic number, because the mean of its divisors is an integer number (121277665).

Almost surely, 2^625537381 is an apocalyptic number.

It is an amenable number.

625537381 is a deficient number, since it is larger than the sum of its proper divisors (102128609).

625537381 is a wasteful number, since it uses less digits than its factorization.

625537381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12766083 (or 12766076 counting only the distinct ones).

The product of its digits is 151200, while the sum is 40.

The square root of 625537381 is about 25010.7453107659. The cubic root of 625537381 is about 855.2329454311.

The spelling of 625537381 in words is "six hundred twenty-five million, five hundred thirty-seven thousand, three hundred eighty-one".