31214081 has 2 divisors, whose sum is σ = 31214082. Its totient is φ = 31214080.

The previous prime is 31214069. The next prime is 31214101. The reversal of 31214081 is 18041213.

It is an a-pointer prime, because the next prime (31214101) can be obtained adding 31214081 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27133681 + 4080400 = 5209^2 + 2020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31214081 is a prime.

It is a super-2 number, since 2×31214081² = 1948637705349122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31214021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15607040 + 15607041.

It is an arithmetic number, because the mean of its divisors is an integer number (15607041).

Almost surely, 2^31214081 is an apocalyptic number.

It is an amenable number.

31214081 is a deficient number, since it is larger than the sum of its proper divisors (1).

31214081 is an equidigital number, since it uses as much as digits as its factorization.

31214081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 31214081 is about 5586.9563270174. The cubic root of 31214081 is about 314.8595359294.

Adding to 31214081 its reverse (18041213), we get a palindrome (49255294).

The spelling of 31214081 in words is "thirty-one million, two hundred fourteen thousand, eighty-one".