155452991 has 2 divisors, whose sum is σ = 155452992. Its totient is φ = 155452990.

The previous prime is 155452967. The next prime is 155453027. The reversal of 155452991 is 199254551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155452991 - 2²² = 151258687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155452901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77726495 + 77726496.

It is an arithmetic number, because the mean of its divisors is an integer number (77726496).

Almost surely, 2^155452991 is an apocalyptic number.

155452991 is a deficient number, since it is larger than the sum of its proper divisors (1).

155452991 is an equidigital number, since it uses as much as digits as its factorization.

155452991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 41.

The square root of 155452991 is about 12468.0788816882. The cubic root of 155452991 is about 537.6913222642.

It can be divided in two parts, 1554 and 52991, that added together give a palindrome (54545).

The spelling of 155452991 in words is "one hundred fifty-five million, four hundred fifty-two thousand, nine hundred ninety-one".