625551131 has 4 divisors (see below), whose sum is σ = 629389032. Its totient is φ = 621713232.

The previous prime is 625551097. The next prime is 625551149. The reversal of 625551131 is 131155526.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131155526 = 2 ⋅65577763.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-625551131 is a prime.

It is a super-2 number, since 2×625551131² = 782628434990758322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 625551094 and 625551103.

It is not an unprimeable number, because it can be changed into a prime (625251131) 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, 1918706 + ... + 1919031.

It is an arithmetic number, because the mean of its divisors is an integer number (157347258).

Almost surely, 2^625551131 is an apocalyptic number.

625551131 is a deficient number, since it is larger than the sum of its proper divisors (3837901).

625551131 is a wasteful number, since it uses less digits than its factorization.

625551131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3837900.

The product of its digits is 4500, while the sum is 29.

The square root of 625551131 is about 25011.0201911078. The cubic root of 625551131 is about 855.2392117056.

The spelling of 625551131 in words is "six hundred twenty-five million, five hundred fifty-one thousand, one hundred thirty-one".