31466381 has 2 divisors, whose sum is σ = 31466382. Its totient is φ = 31466380.

The previous prime is 31466341. The next prime is 31466387. The reversal of 31466381 is 18366413.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30580900 + 885481 = 5530^2 + 941^2 .

It is a cyclic number.

It is not a de Polignac number, because 31466381 - 2¹⁸ = 31204237 is a prime.

It is a super-2 number, since 2×31466381² = 1980266266474322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31466387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15733190 + 15733191.

It is an arithmetic number, because the mean of its divisors is an integer number (15733191).

Almost surely, 2^31466381 is an apocalyptic number.

It is an amenable number.

31466381 is a deficient number, since it is larger than the sum of its proper divisors (1).

31466381 is an equidigital number, since it uses as much as digits as its factorization.

31466381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 32.

The square root of 31466381 is about 5609.4902620470. The cubic root of 31466381 is about 315.7055855532.

Adding to 31466381 its sum of digits (32), we get a palindrome (31466413).

The spelling of 31466381 in words is "thirty-one million, four hundred sixty-six thousand, three hundred eighty-one".