215512401 has 24 divisors (see below), whose sum is σ = 314396544. Its totient is φ = 130537440.

The previous prime is 215512399. The next prime is 215512439. The reversal of 215512401 is 104215512.

215512401 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 215512401 - 2¹ = 215512399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215512471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 174456 + ... + 175686.

It is an arithmetic number, because the mean of its divisors is an integer number (13099856).

Almost surely, 2^215512401 is an apocalyptic number.

It is an amenable number.

215512401 is a deficient number, since it is larger than the sum of its proper divisors (98884143).

215512401 is a wasteful number, since it uses less digits than its factorization.

215512401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381 (or 1314 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 215512401 is about 14680.3406295631. The cubic root of 215512401 is about 599.5481792933.

Adding to 215512401 its reverse (104215512), we get a palindrome (319727913).

The spelling of 215512401 in words is "two hundred fifteen million, five hundred twelve thousand, four hundred one".