520149631 has 4 divisors (see below), whose sum is σ = 521288272. Its totient is φ = 519010992.

The previous prime is 520149593. The next prime is 520149647. The reversal of 520149631 is 136941025.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 520149631 - 2¹³ = 520141439 is a prime.

It is a super-2 number, since 2×520149631² = 541111277258872322, 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 = 520149593 and 520149602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520149661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568635 + ... + 569548.

It is an arithmetic number, because the mean of its divisors is an integer number (130322068).

Almost surely, 2^520149631 is an apocalyptic number.

520149631 is a deficient number, since it is larger than the sum of its proper divisors (1138641).

520149631 is a wasteful number, since it uses less digits than its factorization.

520149631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1138640.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 520149631 is about 22806.7891427092. The cubic root of 520149631 is about 804.2222757587. Note that the first 4 decimals are identical.

The spelling of 520149631 in words is "five hundred twenty million, one hundred forty-nine thousand, six hundred thirty-one".