31228061 has 2 divisors, whose sum is σ = 31228062. Its totient is φ = 31228060.

The previous prime is 31228049. The next prime is 31228063. The reversal of 31228061 is 16082213.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30316036 + 912025 = 5506^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 31228061 - 2¹⁸ = 30965917 is a prime.

It is a Sophie Germain prime.

Together with 31228063, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31228063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15614030 + 15614031.

It is an arithmetic number, because the mean of its divisors is an integer number (15614031).

Almost surely, 2^31228061 is an apocalyptic number.

It is an amenable number.

31228061 is a deficient number, since it is larger than the sum of its proper divisors (1).

31228061 is an equidigital number, since it uses as much as digits as its factorization.

31228061 is an evil number, because the sum of its binary digits is even.

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

The square root of 31228061 is about 5588.2073154098. The cubic root of 31228061 is about 314.9065347965.

The spelling of 31228061 in words is "thirty-one million, two hundred twenty-eight thousand, sixty-one".