155371631 has 2 divisors, whose sum is σ = 155371632. Its totient is φ = 155371630.

The previous prime is 155371583. The next prime is 155371637. The reversal of 155371631 is 136173551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155371631 - 2¹⁴ = 155355247 is a prime.

It is a super-2 number, since 2×155371631² = 48280687439200322, which contains 22 as substring.

It is equal to p_8729240 and since 155371631 and 8729240 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155371637) 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, 77685815 + 77685816.

It is an arithmetic number, because the mean of its divisors is an integer number (77685816).

Almost surely, 2^155371631 is an apocalyptic number.

155371631 is a deficient number, since it is larger than the sum of its proper divisors (1).

155371631 is an equidigital number, since it uses as much as digits as its factorization.

155371631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9450, while the sum is 32.

The square root of 155371631 is about 12464.8157226651. The cubic root of 155371631 is about 537.5975014038.

The spelling of 155371631 in words is "one hundred fifty-five million, three hundred seventy-one thousand, six hundred thirty-one".