215131253 has 2 divisors, whose sum is σ = 215131254. Its totient is φ = 215131252.

The previous prime is 215131181. The next prime is 215131307. The reversal of 215131253 is 352131512.

It is a happy number.

215131253 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135885649 + 79245604 = 11657^2 + 8902^2 .

It is a cyclic number.

It is not a de Polignac number, because 215131253 - 2¹⁶ = 215065717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (215101253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107565626 + 107565627.

It is an arithmetic number, because the mean of its divisors is an integer number (107565627).

Almost surely, 2^215131253 is an apocalyptic number.

It is an amenable number.

215131253 is a deficient number, since it is larger than the sum of its proper divisors (1).

215131253 is an equidigital number, since it uses as much as digits as its factorization.

215131253 is an evil number, because the sum of its binary digits is even.

The product of its digits is 900, while the sum is 23.

The square root of 215131253 is about 14667.3533058967. The cubic root of 215131253 is about 599.1945237936.

Adding to 215131253 its reverse (352131512), we get a palindrome (567262765).

The spelling of 215131253 in words is "two hundred fifteen million, one hundred thirty-one thousand, two hundred fifty-three".