213031157 has 2 divisors, whose sum is σ = 213031158. Its totient is φ = 213031156.

The previous prime is 213031153. The next prime is 213031171. The reversal of 213031157 is 751130312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 203946961 + 9084196 = 14281^2 + 3014^2 .

It is a cyclic number.

It is not a de Polignac number, because 213031157 - 2² = 213031153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213031153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106515578 + 106515579.

It is an arithmetic number, because the mean of its divisors is an integer number (106515579).

Almost surely, 2^213031157 is an apocalyptic number.

It is an amenable number.

213031157 is a deficient number, since it is larger than the sum of its proper divisors (1).

213031157 is an equidigital number, since it uses as much as digits as its factorization.

213031157 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 213031157 is about 14595.5869015261. The cubic root of 213031157 is about 597.2383798884.

Adding to 213031157 its reverse (751130312), we get a palindrome (964161469).

The spelling of 213031157 in words is "two hundred thirteen million, thirty-one thousand, one hundred fifty-seven".