31471698397 has 4 divisors (see below), whose sum is σ = 31474090620. Its totient is φ = 31469306176.

The previous prime is 31471698343. The next prime is 31471698407. The reversal of 31471698397 is 79389617413.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79389617413 = 827 ⋅95997119.

It can be written as a sum of positive squares in 2 ways, for example, as 15693575076 + 15778123321 = 125274^2 + 125611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31471698397 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31471678397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1176268 + ... + 1202725.

It is an arithmetic number, because the mean of its divisors is an integer number (7868522655).

Almost surely, 2^31471698397 is an apocalyptic number.

It is an amenable number.

31471698397 is a deficient number, since it is larger than the sum of its proper divisors (2392223).

31471698397 is a wasteful number, since it uses less digits than its factorization.

31471698397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2392222.

The product of its digits is 6858432, while the sum is 58.

The spelling of 31471698397 in words is "thirty-one billion, four hundred seventy-one million, six hundred ninety-eight thousand, three hundred ninety-seven".