31155049 has 2 divisors, whose sum is σ = 31155050. Its totient is φ = 31155048.

The previous prime is 31155017. The next prime is 31155053. The reversal of 31155049 is 94055113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19079424 + 12075625 = 4368^2 + 3475^2 .

It is an emirp because it is prime and its reverse (94055113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31155049 - 2⁵ = 31155017 is a prime.

It is not a weakly prime, because it can be changed into another prime (31159049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15577524 + 15577525.

It is an arithmetic number, because the mean of its divisors is an integer number (15577525).

Almost surely, 2^31155049 is an apocalyptic number.

It is an amenable number.

31155049 is a deficient number, since it is larger than the sum of its proper divisors (1).

31155049 is an equidigital number, since it uses as much as digits as its factorization.

31155049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 31155049 is about 5581.6708072046. The cubic root of 31155049 is about 314.6609234554.

The spelling of 31155049 in words is "thirty-one million, one hundred fifty-five thousand, forty-nine".