215254505 has 4 divisors (see below), whose sum is σ = 258305412. Its totient is φ = 172203600.

The previous prime is 215254471. The next prime is 215254511. The reversal of 215254505 is 505452512.

215254505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 130393561 + 84860944 = 11419^2 + 9212^2 .

It is not a de Polignac number, because 215254505 - 2¹⁸ = 214992361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21525446 + ... + 21525455.

It is an arithmetic number, because the mean of its divisors is an integer number (64576353).

Almost surely, 2^215254505 is an apocalyptic number.

It is an amenable number.

215254505 is a deficient number, since it is larger than the sum of its proper divisors (43050907).

215254505 is an equidigital number, since it uses as much as digits as its factorization.

215254505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43050906.

The product of its (nonzero) digits is 10000, while the sum is 29.

The square root of 215254505 is about 14671.5542803072. The cubic root of 215254505 is about 599.3089311973.

The spelling of 215254505 in words is "two hundred fifteen million, two hundred fifty-four thousand, five hundred five".