31201243291 has 2 divisors, whose sum is σ = 31201243292. Its totient is φ = 31201243290.

The previous prime is 31201243277. The next prime is 31201243303. The reversal of 31201243291 is 19234210213.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31201243291 - 2⁷ = 31201243163 is a prime.

It is not a weakly prime, because it can be changed into another prime (31201246291) 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, 15600621645 + 15600621646.

It is an arithmetic number, because the mean of its divisors is an integer number (15600621646).

Almost surely, 2^31201243291 is an apocalyptic number.

31201243291 is a deficient number, since it is larger than the sum of its proper divisors (1).

31201243291 is an equidigital number, since it uses as much as digits as its factorization.

31201243291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 28.

The spelling of 31201243291 in words is "thirty-one billion, two hundred one million, two hundred forty-three thousand, two hundred ninety-one".