31854158381 has 2 divisors, whose sum is σ = 31854158382. Its totient is φ = 31854158380.

The previous prime is 31854158317. The next prime is 31854158389. The reversal of 31854158381 is 18385145813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29012308900 + 2841849481 = 170330^2 + 53309^2 .

It is a cyclic number.

It is not a de Polignac number, because 31854158381 - 2⁶ = 31854158317 is a prime.

It is a super-2 number, since 2×31854158381² (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 (31854158389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15927079190 + 15927079191.

It is an arithmetic number, because the mean of its divisors is an integer number (15927079191).

Almost surely, 2^31854158381 is an apocalyptic number.

It is an amenable number.

31854158381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31854158381 is an equidigital number, since it uses as much as digits as its factorization.

31854158381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 460800, while the sum is 47.

The spelling of 31854158381 in words is "thirty-one billion, eight hundred fifty-four million, one hundred fifty-eight thousand, three hundred eighty-one".