31111057 has 2 divisors, whose sum is σ = 31111058. Its totient is φ = 31111056.

The previous prime is 31111013. The next prime is 31111061. The reversal of 31111057 is 75011113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30647296 + 463761 = 5536^2 + 681^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111057 - 2¹¹ = 31109009 is a prime.

It is not a weakly prime, because it can be changed into another prime (31111357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555528 + 15555529.

It is an arithmetic number, because the mean of its divisors is an integer number (15555529).

Almost surely, 2^31111057 is an apocalyptic number.

It is an amenable number.

31111057 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111057 is an equidigital number, since it uses as much as digits as its factorization.

31111057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105, while the sum is 19.

The square root of 31111057 is about 5577.7286595890. The cubic root of 31111057 is about 314.5127496784.

The spelling of 31111057 in words is "thirty-one million, one hundred eleven thousand, fifty-seven".