31021061 has 2 divisors, whose sum is σ = 31021062. Its totient is φ = 31021060.

The previous prime is 31021037. The next prime is 31021069. The reversal of 31021061 is 16012013.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 3876961 = 5210^2 + 1969^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31021061 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31021069) 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, 15510530 + 15510531.

It is an arithmetic number, because the mean of its divisors is an integer number (15510531).

Almost surely, 2^31021061 is an apocalyptic number.

It is an amenable number.

31021061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31021061 is an equidigital number, since it uses as much as digits as its factorization.

31021061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 31021061 is about 5569.6553753352. The cubic root of 31021061 is about 314.2091895840.

Adding to 31021061 its reverse (16012013), we get a palindrome (47033074).

The spelling of 31021061 in words is "thirty-one million, twenty-one thousand, sixty-one".