155331979 has 16 divisors (see below), whose sum is σ = 175518720. Its totient is φ = 136188000.

The previous prime is 155331977. The next prime is 155331983. The reversal of 155331979 is 979133551.

It is a cyclic number.

It is not a de Polignac number, because 155331979 - 2¹ = 155331977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155331977) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132064 + ... + 133234.

It is an arithmetic number, because the mean of its divisors is an integer number (10969920).

Almost surely, 2^155331979 is an apocalyptic number.

155331979 is a deficient number, since it is larger than the sum of its proper divisors (20186741).

155331979 is a wasteful number, since it uses less digits than its factorization.

155331979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602.

The product of its digits is 127575, while the sum is 43.

The square root of 155331979 is about 12463.2250641638. The cubic root of 155331979 is about 537.5517645477.

The spelling of 155331979 in words is "one hundred fifty-five million, three hundred thirty-one thousand, nine hundred seventy-nine".