31213159 has 2 divisors, whose sum is σ = 31213160. Its totient is φ = 31213158.

The previous prime is 31213157. The next prime is 31213201. The reversal of 31213159 is 95131213.

It is a weak prime.

It is an emirp because it is prime and its reverse (95131213) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31213159 - 2¹ = 31213157 is a prime.

It is a super-2 number, since 2×31213159² = 1948522589518562, which contains 22 as substring.

Together with 31213157, it forms a pair of twin primes.

It is a plaindrome in base 11.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31213157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606579 + 15606580.

It is an arithmetic number, because the mean of its divisors is an integer number (15606580).

Almost surely, 2^31213159 is an apocalyptic number.

31213159 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213159 is an equidigital number, since it uses as much as digits as its factorization.

31213159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 810, while the sum is 25.

The square root of 31213159 is about 5586.8738127865. The cubic root of 31213159 is about 314.8564357970.

The spelling of 31213159 in words is "thirty-one million, two hundred thirteen thousand, one hundred fifty-nine".