213620137 has 2 divisors, whose sum is σ = 213620138. Its totient is φ = 213620136.

The previous prime is 213620111. The next prime is 213620149. The reversal of 213620137 is 731026312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173475241 + 40144896 = 13171^2 + 6336^2 .

It is a cyclic number.

It is not a de Polignac number, because 213620137 - 2²⁷ = 79402409 is a prime.

It is not a weakly prime, because it can be changed into another prime (213620167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106810068 + 106810069.

It is an arithmetic number, because the mean of its divisors is an integer number (106810069).

Almost surely, 2^213620137 is an apocalyptic number.

It is an amenable number.

213620137 is a deficient number, since it is larger than the sum of its proper divisors (1).

213620137 is an equidigital number, since it uses as much as digits as its factorization.

213620137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 25.

The square root of 213620137 is about 14615.7496215555. The cubic root of 213620137 is about 597.7882803260.

Adding to 213620137 its reverse (731026312), we get a palindrome (944646449).

The spelling of 213620137 in words is "two hundred thirteen million, six hundred twenty thousand, one hundred thirty-seven".