31427151893 has 2 divisors, whose sum is σ = 31427151894. Its totient is φ = 31427151892.

The previous prime is 31427151863. The next prime is 31427151901. The reversal of 31427151893 is 39815172413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23500276804 + 7926875089 = 153298^2 + 89033^2 .

It is a cyclic number.

It is not a de Polignac number, because 31427151893 - 2⁶ = 31427151829 is a prime.

It is a super-2 number, since 2×31427151893² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31427151803) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15713575946 + 15713575947.

It is an arithmetic number, because the mean of its divisors is an integer number (15713575947).

Almost surely, 2^31427151893 is an apocalyptic number.

It is an amenable number.

31427151893 is a deficient number, since it is larger than the sum of its proper divisors (1).

31427151893 is an equidigital number, since it uses as much as digits as its factorization.

31427151893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The spelling of 31427151893 in words is "thirty-one billion, four hundred twenty-seven million, one hundred fifty-one thousand, eight hundred ninety-three".