155293091 has 2 divisors, whose sum is σ = 155293092. Its totient is φ = 155293090.

The previous prime is 155293087. The next prime is 155293093. The reversal of 155293091 is 190392551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155293091 - 2² = 155293087 is a prime.

It is a super-2 number, since 2×155293091² = 48231888224668562, which contains 22 as substring.

Together with 155293093, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155293093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77646545 + 77646546.

It is an arithmetic number, because the mean of its divisors is an integer number (77646546).

Almost surely, 2^155293091 is an apocalyptic number.

155293091 is a deficient number, since it is larger than the sum of its proper divisors (1).

155293091 is an equidigital number, since it uses as much as digits as its factorization.

155293091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 155293091 is about 12461.6648566714. The cubic root of 155293091 is about 537.5069013716.

The spelling of 155293091 in words is "one hundred fifty-five million, two hundred ninety-three thousand, ninety-one".