155022157 has 4 divisors (see below), whose sum is σ = 155438140. Its totient is φ = 154606176.

The previous prime is 155022149. The next prime is 155022163. The reversal of 155022157 is 751220551.

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 59197636 + 95824521 = 7694^2 + 9789^2 .

It is a cyclic number.

It is not a de Polignac number, because 155022157 - 2³ = 155022149 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 (155022557) 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, 207432 + ... + 208177.

It is an arithmetic number, because the mean of its divisors is an integer number (38859535).

Almost surely, 2^155022157 is an apocalyptic number.

It is an amenable number.

155022157 is a deficient number, since it is larger than the sum of its proper divisors (415983).

155022157 is an equidigital number, since it uses as much as digits as its factorization.

155022157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415982.

The product of its (nonzero) digits is 3500, while the sum is 28.

The square root of 155022157 is about 12450.7894127240. The cubic root of 155022157 is about 537.1941300669.

The spelling of 155022157 in words is "one hundred fifty-five million, twenty-two thousand, one hundred fifty-seven".