31099697 has 2 divisors, whose sum is σ = 31099698. Its totient is φ = 31099696.

The previous prime is 31099669. The next prime is 31099741. The reversal of 31099697 is 79699013.

It is a happy number.

It is an a-pointer prime, because the next prime (31099741) can be obtained adding 31099697 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31091776 + 7921 = 5576^2 + 89^2 .

It is a cyclic number.

It is not a de Polignac number, because 31099697 - 2¹⁶ = 31034161 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (31099097) 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, 15549848 + 15549849.

It is an arithmetic number, because the mean of its divisors is an integer number (15549849).

Almost surely, 2^31099697 is an apocalyptic number.

It is an amenable number.

31099697 is a deficient number, since it is larger than the sum of its proper divisors (1).

31099697 is an equidigital number, since it uses as much as digits as its factorization.

31099697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 31099697 is about 5576.7102309516. The cubic root of 31099697 is about 314.4744642569.

The spelling of 31099697 in words is "thirty-one million, ninety-nine thousand, six hundred ninety-seven".