215553401 has 24 divisors (see below), whose sum is σ = 263268864. Its totient is φ = 175633920.

The previous prime is 215553391. The next prime is 215553427. The reversal of 215553401 is 104355512.

It is not a de Polignac number, because 215553401 - 2⁶ = 215553337 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215553901) 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, 217016 + ... + 218006.

It is an arithmetic number, because the mean of its divisors is an integer number (10969536).

Almost surely, 2^215553401 is an apocalyptic number.

It is an amenable number.

215553401 is a deficient number, since it is larger than the sum of its proper divisors (47715463).

215553401 is a wasteful number, since it uses less digits than its factorization.

215553401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221 (or 1214 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 215553401 is about 14681.7369885174. The cubic root of 215553401 is about 599.5861970849.

The spelling of 215553401 in words is "two hundred fifteen million, five hundred fifty-three thousand, four hundred one".