31089991549 has 8 divisors (see below), whose sum is σ = 32454608832. Its totient is φ = 29726447520.

The previous prime is 31089991547. The next prime is 31089991553. The reversal of 31089991549 is 94519998013.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31089991549 - 2¹ = 31089991547 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31089991493 and 31089991502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31089991547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208824 + ... + 325249.

It is an arithmetic number, because the mean of its divisors is an integer number (4056826104).

Almost surely, 2^31089991549 is an apocalyptic number.

It is an amenable number.

31089991549 is a deficient number, since it is larger than the sum of its proper divisors (1364617283).

31089991549 is a wasteful number, since it uses less digits than its factorization.

31089991549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536627.

The product of its (nonzero) digits is 3149280, while the sum is 58.

The spelling of 31089991549 in words is "thirty-one billion, eighty-nine million, nine hundred ninety-one thousand, five hundred forty-nine".