155400081 has 8 divisors (see below), whose sum is σ = 211109760. Its totient is φ = 101645232.

The previous prime is 155400079. The next prime is 155400109. The reversal of 155400081 is 180004551.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 155400081 - 2¹ = 155400079 is a prime.

It is a super-2 number, since 2×155400081² = 48298370349613122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (155400061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488521 + ... + 488838.

It is an arithmetic number, because the mean of its divisors is an integer number (26388720).

Almost surely, 2^155400081 is an apocalyptic number.

It is an amenable number.

155400081 is a deficient number, since it is larger than the sum of its proper divisors (55709679).

155400081 is an equidigital number, since it uses as much as digits as its factorization.

155400081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977415.

The product of its (nonzero) digits is 800, while the sum is 24.

The square root of 155400081 is about 12465.9568826464. The cubic root of 155400081 is about 537.6303124461.

The spelling of 155400081 in words is "one hundred fifty-five million, four hundred thousand, eighty-one".