31001021929 has 2 divisors, whose sum is σ = 31001021930. Its totient is φ = 31001021928.

The previous prime is 31001021923. The next prime is 31001021969. The reversal of 31001021929 is 92912010013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29430088704 + 1570933225 = 171552^2 + 39635^2 .

It is a cyclic number.

It is not a de Polignac number, because 31001021929 - 2¹³ = 31001013737 is a prime.

It is a super-2 number, since 2×31001021929² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31001021897 and 31001021906.

It is not a weakly prime, because it can be changed into another prime (31001021923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500510964 + 15500510965.

It is an arithmetic number, because the mean of its divisors is an integer number (15500510965).

Almost surely, 2^31001021929 is an apocalyptic number.

It is an amenable number.

31001021929 is a deficient number, since it is larger than the sum of its proper divisors (1).

31001021929 is an equidigital number, since it uses as much as digits as its factorization.

31001021929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The spelling of 31001021929 in words is "thirty-one billion, one million, twenty-one thousand, nine hundred twenty-nine".