31445254381 has 2 divisors, whose sum is σ = 31445254382. Its totient is φ = 31445254380.

The previous prime is 31445254339. The next prime is 31445254403. The reversal of 31445254381 is 18345254413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31208402281 + 236852100 = 176659^2 + 15390^2 .

It is a cyclic number.

It is not a de Polignac number, because 31445254381 - 2¹⁷ = 31445123309 is a prime.

It is a super-2 number, since 2×31445254381² (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 (31445254301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15722627190 + 15722627191.

It is an arithmetic number, because the mean of its divisors is an integer number (15722627191).

Almost surely, 2^31445254381 is an apocalyptic number.

It is an amenable number.

31445254381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31445254381 is an equidigital number, since it uses as much as digits as its factorization.

31445254381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230400, while the sum is 40.

It can be divided in two parts, 3144 and 5254381, that added together give a palindrome (5257525).

The spelling of 31445254381 in words is "thirty-one billion, four hundred forty-five million, two hundred fifty-four thousand, three hundred eighty-one".