155921149 has 4 divisors (see below), whose sum is σ = 157378464. Its totient is φ = 154463836.

The previous prime is 155921141. The next prime is 155921167. The reversal of 155921149 is 941129551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 155921149 - 2³ = 155921141 is a prime.

It is a super-2 number, since 2×155921149² = 48622809410960402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155921141) 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, 728497 + ... + 728710.

It is an arithmetic number, because the mean of its divisors is an integer number (39344616).

Almost surely, 2^155921149 is an apocalyptic number.

It is an amenable number.

155921149 is a deficient number, since it is larger than the sum of its proper divisors (1457315).

155921149 is a wasteful number, since it uses less digits than its factorization.

155921149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457314.

The product of its digits is 16200, while the sum is 37.

The square root of 155921149 is about 12486.8390315564. The cubic root of 155921149 is about 538.2305468423.

The spelling of 155921149 in words is "one hundred fifty-five million, nine hundred twenty-one thousand, one hundred forty-nine".