52215397 has 4 divisors (see below), whose sum is σ = 56231980. Its totient is φ = 48198816.

The previous prime is 52215343. The next prime is 52215409. The reversal of 52215397 is 79351225.

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 3690241 + 48525156 = 1921^2 + 6966^2 .

It is a cyclic number.

It is not a de Polignac number, because 52215397 - 2⁷ = 52215269 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 (52215337) 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, 2008272 + ... + 2008297.

It is an arithmetic number, because the mean of its divisors is an integer number (14057995).

Almost surely, 2^52215397 is an apocalyptic number.

It is an amenable number.

52215397 is a deficient number, since it is larger than the sum of its proper divisors (4016583).

52215397 is a wasteful number, since it uses less digits than its factorization.

52215397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4016582.

The product of its digits is 18900, while the sum is 34.

The square root of 52215397 is about 7226.0222114245. The cubic root of 52215397 is about 373.7657722005.

The spelling of 52215397 in words is "fifty-two million, two hundred fifteen thousand, three hundred ninety-seven".