505155631 has 2 divisors, whose sum is σ = 505155632. Its totient is φ = 505155630.

The previous prime is 505155619. The next prime is 505155643. The reversal of 505155631 is 136551505.

It is a balanced prime because it is at equal distance from previous prime (505155619) and next prime (505155643).

It is a cyclic number.

It is not a de Polignac number, because 505155631 - 2⁷ = 505155503 is a prime.

It is a super-2 number, since 2×505155631² = 510364423062016322, which contains 22 as substring.

It is equal to p_26612743 and since 505155631 and 26612743 have the same sum of digits, it is a Honaker prime.

It is a junction number, because it is equal to n+sod(n) for n = 505155593 and 505155602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505155661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252577815 + 252577816.

It is an arithmetic number, because the mean of its divisors is an integer number (252577816).

Almost surely, 2^505155631 is an apocalyptic number.

505155631 is a deficient number, since it is larger than the sum of its proper divisors (1).

505155631 is an equidigital number, since it uses as much as digits as its factorization.

505155631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11250, while the sum is 31.

The square root of 505155631 is about 22475.6675317998. The cubic root of 505155631 is about 796.4192209185.

The spelling of 505155631 in words is "five hundred five million, one hundred fifty-five thousand, six hundred thirty-one".