155400861 has 32 divisors (see below), whose sum is σ = 266674176. Its totient is φ = 78120000.

The previous prime is 155400841. The next prime is 155400863. The reversal of 155400861 is 168004551.

155400861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155400861 - 2⁶ = 155400797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155400863) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3690 + ... + 18011.

It is an arithmetic number, because the mean of its divisors is an integer number (8333568).

Almost surely, 2^155400861 is an apocalyptic number.

155400861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

155400861 is a deficient number, since it is larger than the sum of its proper divisors (111273315).

155400861 is a wasteful number, since it uses less digits than its factorization.

155400861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21753.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 155400861 is about 12465.9881678108. The cubic root of 155400861 is about 537.6312119543.

The spelling of 155400861 in words is "one hundred fifty-five million, four hundred thousand, eight hundred sixty-one".