155379861 has 48 divisors (see below), whose sum is σ = 277944576. Its totient is φ = 81451008.

The previous prime is 155379841. The next prime is 155379869. The reversal of 155379861 is 168973551.

It is a happy number.

155379861 is a `hidden beast` number, since 1 + 553 + 7 + 98 + 6 + 1 = 666.

It is not a de Polignac number, because 155379861 - 2⁹ = 155379349 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155379869) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157576 + ... + 158558.

It is an arithmetic number, because the mean of its divisors is an integer number (5790512).

Almost surely, 2^155379861 is an apocalyptic number.

It is an amenable number.

155379861 is a deficient number, since it is larger than the sum of its proper divisors (122564715).

155379861 is a wasteful number, since it uses less digits than its factorization.

155379861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202 (or 1199 counting only the distinct ones).

The product of its digits is 226800, while the sum is 45.

The square root of 155379861 is about 12465.1458475222. The cubic root of 155379861 is about 537.6069933754.

The spelling of 155379861 in words is "one hundred fifty-five million, three hundred seventy-nine thousand, eight hundred sixty-one".