31201139 has 2 divisors, whose sum is σ = 31201140. Its totient is φ = 31201138.

The previous prime is 31201109. The next prime is 31201169. The reversal of 31201139 is 93110213.

It is a balanced prime because it is at equal distance from previous prime (31201109) and next prime (31201169).

It is a cyclic number.

It is not a de Polignac number, because 31201139 - 2¹⁶ = 31135603 is a prime.

It is a super-2 number, since 2×31201139² = 1947022149794642, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31201139.

It is not a weakly prime, because it can be changed into another prime (31201109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15600569 + 15600570.

It is an arithmetic number, because the mean of its divisors is an integer number (15600570).

Almost surely, 2^31201139 is an apocalyptic number.

31201139 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201139 is an equidigital number, since it uses as much as digits as its factorization.

31201139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 31201139 is about 5585.7979734323. The cubic root of 31201139 is about 314.8160141672.

The spelling of 31201139 in words is "thirty-one million, two hundred one thousand, one hundred thirty-nine".