155249293 has 4 divisors (see below), whose sum is σ = 156238300. Its totient is φ = 154260288.

The previous prime is 155249257. The next prime is 155249309. The reversal of 155249293 is 392942551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26245129 + 129004164 = 5123^2 + 11358^2 .

It is a cyclic number.

It is not a de Polignac number, because 155249293 - 2²⁵ = 121694861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155549293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494268 + ... + 494581.

It is an arithmetic number, because the mean of its divisors is an integer number (39059575).

Almost surely, 2^155249293 is an apocalyptic number.

It is an amenable number.

155249293 is a deficient number, since it is larger than the sum of its proper divisors (989007).

155249293 is an equidigital number, since it uses as much as digits as its factorization.

155249293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989006.

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

The square root of 155249293 is about 12459.9074234121. The cubic root of 155249293 is about 537.4563648010.

The spelling of 155249293 in words is "one hundred fifty-five million, two hundred forty-nine thousand, two hundred ninety-three".