31012201331 has 2 divisors, whose sum is σ = 31012201332. Its totient is φ = 31012201330.

The previous prime is 31012201303. The next prime is 31012201351. The reversal of 31012201331 is 13310221013.

It is a strong prime.

It is an emirp because it is prime and its reverse (13310221013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31012201331 - 2²² = 31008007027 is a prime.

It is a super-2 number, since 2×31012201331² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31012201301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15506100665 + 15506100666.

It is an arithmetic number, because the mean of its divisors is an integer number (15506100666).

Almost surely, 2^31012201331 is an apocalyptic number.

31012201331 is a deficient number, since it is larger than the sum of its proper divisors (1).

31012201331 is an equidigital number, since it uses as much as digits as its factorization.

31012201331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31012201331 its reverse (13310221013), we get a palindrome (44322422344).

The spelling of 31012201331 in words is "thirty-one billion, twelve million, two hundred one thousand, three hundred thirty-one".