155115431 has 2 divisors, whose sum is σ = 155115432. Its totient is φ = 155115430.

The previous prime is 155115421. The next prime is 155115469. The reversal of 155115431 is 134511551.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155115431 is a prime.

It is a super-2 number, since 2×155115431² = 48121593868631522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155115431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155115421) 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 as a sum of consecutive naturals, namely, 77557715 + 77557716.

It is an arithmetic number, because the mean of its divisors is an integer number (77557716).

Almost surely, 2^155115431 is an apocalyptic number.

155115431 is a deficient number, since it is larger than the sum of its proper divisors (1).

155115431 is an equidigital number, since it uses as much as digits as its factorization.

155115431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1500, while the sum is 26.

The square root of 155115431 is about 12454.5345557351. The cubic root of 155115431 is about 537.3018484307.

Adding to 155115431 its reverse (134511551), we get a palindrome (289626982).

The spelling of 155115431 in words is "one hundred fifty-five million, one hundred fifteen thousand, four hundred thirty-one".