505557031 has 4 divisors (see below), whose sum is σ = 577779472. Its totient is φ = 433334592.

The previous prime is 505557023. The next prime is 505557037. The reversal of 505557031 is 130755505.

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 505557031 - 2³ = 505557023 is a prime.

It is a super-2 number, since 2×505557031² = 511175823187069922, 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 = 505556984 and 505557002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505557037) 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, 36111210 + ... + 36111223.

It is an arithmetic number, because the mean of its divisors is an integer number (144444868).

Almost surely, 2^505557031 is an apocalyptic number.

505557031 is a deficient number, since it is larger than the sum of its proper divisors (72222441).

505557031 is an equidigital number, since it uses as much as digits as its factorization.

505557031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72222440.

The product of its (nonzero) digits is 13125, while the sum is 31.

The square root of 505557031 is about 22484.5954155284. The cubic root of 505557031 is about 796.6301117272.

The spelling of 505557031 in words is "five hundred five million, five hundred fifty-seven thousand, thirty-one".