155649631 has 2 divisors, whose sum is σ = 155649632. Its totient is φ = 155649630.

The previous prime is 155649623. The next prime is 155649647. The reversal of 155649631 is 136946551.

It is a happy number.

155649631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155649631 - 2³ = 155649623 is a prime.

It is a super-2 number, since 2×155649631² = 48453615260872322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155649601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77824815 + 77824816.

It is an arithmetic number, because the mean of its divisors is an integer number (77824816).

Almost surely, 2^155649631 is an apocalyptic number.

155649631 is a deficient number, since it is larger than the sum of its proper divisors (1).

155649631 is an equidigital number, since it uses as much as digits as its factorization.

155649631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 40.

The square root of 155649631 is about 12475.9621272269. The cubic root of 155649631 is about 537.9179439813.

The spelling of 155649631 in words is "one hundred fifty-five million, six hundred forty-nine thousand, six hundred thirty-one".