215156601 has 16 divisors (see below), whose sum is σ = 347728320. Its totient is φ = 130397760.

The previous prime is 215156549. The next prime is 215156603. The reversal of 215156601 is 106651512.

It is a happy number.

215156601 is a `hidden beast` number, since 2 + 1 + 5 + 1 + 56 + 601 = 666.

It is not a de Polignac number, because 215156601 - 2¹¹ = 215154553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (215156603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 361920 + ... + 362513.

It is an arithmetic number, because the mean of its divisors is an integer number (21733020).

Almost surely, 2^215156601 is an apocalyptic number.

It is an amenable number.

215156601 is a deficient number, since it is larger than the sum of its proper divisors (132571719).

215156601 is a wasteful number, since it uses less digits than its factorization.

215156601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724453 (or 724447 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 215156601 is about 14668.2173763549. The cubic root of 215156601 is about 599.2180563830.

It can be divided in two parts, 215 and 156601, that added together give a square (156816 = 396²).

The spelling of 215156601 in words is "two hundred fifteen million, one hundred fifty-six thousand, six hundred one".