31211920601 has 2 divisors, whose sum is σ = 31211920602. Its totient is φ = 31211920600.

The previous prime is 31211920517. The next prime is 31211920603. The reversal of 31211920601 is 10602911213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31166371600 + 45549001 = 176540^2 + 6749^2 .

It is a cyclic number.

It is not a de Polignac number, because 31211920601 - 2¹⁰ = 31211919577 is a prime.

Together with 31211920603, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31211920603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15605960300 + 15605960301.

It is an arithmetic number, because the mean of its divisors is an integer number (15605960301).

Almost surely, 2^31211920601 is an apocalyptic number.

It is an amenable number.

31211920601 is a deficient number, since it is larger than the sum of its proper divisors (1).

31211920601 is an equidigital number, since it uses as much as digits as its factorization.

31211920601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 26.

The spelling of 31211920601 in words is "thirty-one billion, two hundred eleven million, nine hundred twenty thousand, six hundred one".