31143043969 has 2 divisors, whose sum is σ = 31143043970. Its totient is φ = 31143043968.

The previous prime is 31143043961. The next prime is 31143044003. The reversal of 31143043969 is 96934034113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27402498369 + 3740545600 = 165537^2 + 61160^2 .

It is a cyclic number.

It is not a de Polignac number, because 31143043969 - 2³ = 31143043961 is a prime.

It is a super-2 number, since 2×31143043969² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31143043961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15571521984 + 15571521985.

It is an arithmetic number, because the mean of its divisors is an integer number (15571521985).

Almost surely, 2^31143043969 is an apocalyptic number.

It is an amenable number.

31143043969 is a deficient number, since it is larger than the sum of its proper divisors (1).

31143043969 is an equidigital number, since it uses as much as digits as its factorization.

31143043969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 43.

The spelling of 31143043969 in words is "thirty-one billion, one hundred forty-three million, forty-three thousand, nine hundred sixty-nine".