31404400381 has 2 divisors, whose sum is σ = 31404400382. Its totient is φ = 31404400380.

The previous prime is 31404400369. The next prime is 31404400393. The reversal of 31404400381 is 18300440413.

It is a balanced prime because it is at equal distance from previous prime (31404400369) and next prime (31404400393).

It can be written as a sum of positive squares in only one way, i.e., 19478668356 + 11925732025 = 139566^2 + 109205^2 .

It is a cyclic number.

It is not a de Polignac number, because 31404400381 - 2³³ = 22814465789 is a prime.

It is a super-2 number, since 2×31404400381² (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 (31404400081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15702200190 + 15702200191.

It is an arithmetic number, because the mean of its divisors is an integer number (15702200191).

Almost surely, 2^31404400381 is an apocalyptic number.

It is an amenable number.

31404400381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31404400381 is an equidigital number, since it uses as much as digits as its factorization.

31404400381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 31404400381 its reverse (18300440413), we get a palindrome (49704840794).

The spelling of 31404400381 in words is "thirty-one billion, four hundred four million, four hundred thousand, three hundred eighty-one".