31498504991 has 4 divisors (see below), whose sum is σ = 32868005232. Its totient is φ = 30129004752.

The previous prime is 31498504967. The next prime is 31498505009. The reversal of 31498504991 is 19940589413.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31498504991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31498504901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684750086 + ... + 684750131.

It is an arithmetic number, because the mean of its divisors is an integer number (8217001308).

Almost surely, 2^31498504991 is an apocalyptic number.

31498504991 is a deficient number, since it is larger than the sum of its proper divisors (1369500241).

31498504991 is a wasteful number, since it uses less digits than its factorization.

31498504991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369500240.

The product of its (nonzero) digits is 1399680, while the sum is 53.

The spelling of 31498504991 in words is "thirty-one billion, four hundred ninety-eight million, five hundred four thousand, nine hundred ninety-one".