31423356091 has 2 divisors, whose sum is σ = 31423356092. Its totient is φ = 31423356090.

The previous prime is 31423356071. The next prime is 31423356149. The reversal of 31423356091 is 19065332413.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31423356091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31423356091.

It is not a weakly prime, because it can be changed into another prime (31423356031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15711678045 + 15711678046.

It is an arithmetic number, because the mean of its divisors is an integer number (15711678046).

Almost surely, 2^31423356091 is an apocalyptic number.

31423356091 is a deficient number, since it is larger than the sum of its proper divisors (1).

31423356091 is an equidigital number, since it uses as much as digits as its factorization.

31423356091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The spelling of 31423356091 in words is "thirty-one billion, four hundred twenty-three million, three hundred fifty-six thousand, ninety-one".