215397701 has 4 divisors (see below), whose sum is σ = 228068172. Its totient is φ = 202727232.

The previous prime is 215397673. The next prime is 215397709. The reversal of 215397701 is 107793512.

It is a happy number.

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 129390625 + 86007076 = 11375^2 + 9274^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215397701 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215397709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6335210 + ... + 6335243.

It is an arithmetic number, because the mean of its divisors is an integer number (57017043).

Almost surely, 2^215397701 is an apocalyptic number.

It is an amenable number.

215397701 is a deficient number, since it is larger than the sum of its proper divisors (12670471).

215397701 is a wasteful number, since it uses less digits than its factorization.

215397701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12670470.

The product of its (nonzero) digits is 13230, while the sum is 35.

The square root of 215397701 is about 14676.4335245318. The cubic root of 215397701 is about 599.4417965834.

The spelling of 215397701 in words is "two hundred fifteen million, three hundred ninety-seven thousand, seven hundred one".