31099493 has 2 divisors, whose sum is σ = 31099494. Its totient is φ = 31099492.

The previous prime is 31099469. The next prime is 31099517. The reversal of 31099493 is 39499013.

It is a balanced prime because it is at equal distance from previous prime (31099469) and next prime (31099517).

It can be written as a sum of positive squares in only one way, i.e., 26697889 + 4401604 = 5167^2 + 2098^2 .

It is an emirp because it is prime and its reverse (39499013) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31099493 - 2¹⁶ = 31033957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31099403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15549746 + 15549747.

It is an arithmetic number, because the mean of its divisors is an integer number (15549747).

Almost surely, 2^31099493 is an apocalyptic number.

It is an amenable number.

31099493 is a deficient number, since it is larger than the sum of its proper divisors (1).

31099493 is an equidigital number, since it uses as much as digits as its factorization.

31099493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 38.

The square root of 31099493 is about 5576.6919405684. The cubic root of 31099493 is about 314.4737766518.

The spelling of 31099493 in words is "thirty-one million, ninety-nine thousand, four hundred ninety-three".