31413281 has 2 divisors, whose sum is σ = 31413282. Its totient is φ = 31413280.

The previous prime is 31413269. The next prime is 31413307. The reversal of 31413281 is 18231413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 8755681 = 4760^2 + 2959^2 .

It is a cyclic number.

It is not a de Polignac number, because 31413281 - 2¹⁰ = 31412257 is a prime.

It is a super-2 number, since 2×31413281² = 1973588446369922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31413211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15706640 + 15706641.

It is an arithmetic number, because the mean of its divisors is an integer number (15706641).

Almost surely, 2^31413281 is an apocalyptic number.

It is an amenable number.

31413281 is a deficient number, since it is larger than the sum of its proper divisors (1).

31413281 is an equidigital number, since it uses as much as digits as its factorization.

31413281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 23.

The square root of 31413281 is about 5604.7552132096. The cubic root of 31413281 is about 315.5278995624.

Adding to 31413281 its reverse (18231413), we get a palindrome (49644694).

The spelling of 31413281 in words is "thirty-one million, four hundred thirteen thousand, two hundred eighty-one".