215261455 has 16 divisors (see below), whose sum is σ = 260568000. Its totient is φ = 170714880.

The previous prime is 215261447. The next prime is 215261467. The reversal of 215261455 is 554162512.

It is not a de Polignac number, because 215261455 - 2³ = 215261447 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 490126 + ... + 490564.

It is an arithmetic number, because the mean of its divisors is an integer number (16285500).

Almost surely, 2^215261455 is an apocalyptic number.

215261455 is a deficient number, since it is larger than the sum of its proper divisors (45306545).

215261455 is a wasteful number, since it uses less digits than its factorization.

215261455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074.

The product of its digits is 12000, while the sum is 31.

The square root of 215261455 is about 14671.7911312832. The cubic root of 215261455 is about 599.3153811626.

The spelling of 215261455 in words is "two hundred fifteen million, two hundred sixty-one thousand, four hundred fifty-five".