155231455 has 4 divisors (see below), whose sum is σ = 186277752. Its totient is φ = 124185160.

The previous prime is 155231441. The next prime is 155231509. The reversal of 155231455 is 554132551.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 155231455 - 2⁷ = 155231327 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 15523141 + ... + 15523150.

It is an arithmetic number, because the mean of its divisors is an integer number (46569438).

Almost surely, 2^155231455 is an apocalyptic number.

155231455 is a deficient number, since it is larger than the sum of its proper divisors (31046297).

155231455 is an equidigital number, since it uses as much as digits as its factorization.

155231455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31046296.

The product of its digits is 15000, while the sum is 31.

The square root of 155231455 is about 12459.1915869369. The cubic root of 155231455 is about 537.4357795997.

The spelling of 155231455 in words is "one hundred fifty-five million, two hundred thirty-one thousand, four hundred fifty-five".