31378461181 has 2 divisors, whose sum is σ = 31378461182. Its totient is φ = 31378461180.

The previous prime is 31378461143. The next prime is 31378461193. The reversal of 31378461181 is 18116487313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18629793081 + 12748668100 = 136491^2 + 112910^2 .

It is a cyclic number.

It is not a de Polignac number, because 31378461181 - 2⁷ = 31378461053 is a prime.

It is a super-2 number, since 2×31378461181² (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 (31378467181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15689230590 + 15689230591.

It is an arithmetic number, because the mean of its divisors is an integer number (15689230591).

Almost surely, 2^31378461181 is an apocalyptic number.

It is an amenable number.

31378461181 is a deficient number, since it is larger than the sum of its proper divisors (1).

31378461181 is an equidigital number, since it uses as much as digits as its factorization.

31378461181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The spelling of 31378461181 in words is "thirty-one billion, three hundred seventy-eight million, four hundred sixty-one thousand, one hundred eighty-one".