31431434423989 has 2 divisors, whose sum is σ = 31431434423990. Its totient is φ = 31431434423988.

The previous prime is 31431434423951. The next prime is 31431434424053. The reversal of 31431434423989 is 98932443413413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16514714268900 + 14916720155089 = 4063830^2 + 3862217^2 .

It is a cyclic number.

It is not a de Polignac number, because 31431434423989 - 2¹⁵ = 31431434391221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31431434423489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15715717211994 + 15715717211995.

It is an arithmetic number, because the mean of its divisors is an integer number (15715717211995).

Almost surely, 2^{31431434423989} is an apocalyptic number.

It is an amenable number.

31431434423989 is a deficient number, since it is larger than the sum of its proper divisors (1).

31431434423989 is an equidigital number, since it uses as much as digits as its factorization.

31431434423989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 58.

The spelling of 31431434423989 in words is "thirty-one trillion, four hundred thirty-one billion, four hundred thirty-four million, four hundred twenty-three thousand, nine hundred eighty-nine".