31020377893 has 2 divisors, whose sum is σ = 31020377894. Its totient is φ = 31020377892.

The previous prime is 31020377879. The next prime is 31020377923. The reversal of 31020377893 is 39877302013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21922651969 + 9097725924 = 148063^2 + 95382^2 .

It is an emirp because it is prime and its reverse (39877302013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31020377893 - 2¹³ = 31020369701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31020377803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510188946 + 15510188947.

It is an arithmetic number, because the mean of its divisors is an integer number (15510188947).

Almost surely, 2^31020377893 is an apocalyptic number.

It is an amenable number.

31020377893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020377893 is an equidigital number, since it uses as much as digits as its factorization.

31020377893 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 43.

The spelling of 31020377893 in words is "thirty-one billion, twenty million, three hundred seventy-seven thousand, eight hundred ninety-three".