31491097198 has 16 divisors (see below), whose sum is σ = 51534313776. Its totient is φ = 14313183040.

The previous prime is 31491097193. The next prime is 31491097199. The reversal of 31491097198 is 89179019413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31491097193) 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, 373440 + ... + 449932.

It is an arithmetic number, because the mean of its divisors is an integer number (3220894611).

Almost surely, 2^31491097198 is an apocalyptic number.

31491097198 is a deficient number, since it is larger than the sum of its proper divisors (20043216578).

31491097198 is a wasteful number, since it uses less digits than its factorization.

31491097198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95219.

The product of its (nonzero) digits is 489888, while the sum is 52.

The spelling of 31491097198 in words is "thirty-one billion, four hundred ninety-one million, ninety-seven thousand, one hundred ninety-eight".