645165031 has 8 divisors (see below), whose sum is σ = 737628320. Its totient is φ = 552775968.

The previous prime is 645165023. The next prime is 645165061. The reversal of 645165031 is 130561546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 645165031 - 2³ = 645165023 is a prime.

It is a super-2 number, since 2×645165031² = 832475834450461922, 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 = 645164984 and 645165002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645165061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1525 + ... + 35953.

It is an arithmetic number, because the mean of its divisors is an integer number (92203540).

Almost surely, 2^645165031 is an apocalyptic number.

645165031 is a deficient number, since it is larger than the sum of its proper divisors (92463289).

645165031 is a wasteful number, since it uses less digits than its factorization.

645165031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37113.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 645165031 is about 25400.0990352400. The cubic root of 645165031 is about 864.0859427934.

The spelling of 645165031 in words is "six hundred forty-five million, one hundred sixty-five thousand, thirty-one".