31690978841 has 4 divisors (see below), whose sum is σ = 32288921892. Its totient is φ = 31093035792.

The previous prime is 31690978831. The next prime is 31690978867. The reversal of 31690978841 is 14887909613.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9681772816 + 22009206025 = 98396^2 + 148355^2 .

It is a cyclic number.

It is not a de Polignac number, because 31690978841 - 2⁶ = 31690978777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31690978811) 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, 298971446 + ... + 298971551.

It is an arithmetic number, because the mean of its divisors is an integer number (8072230473).

Almost surely, 2^31690978841 is an apocalyptic number.

It is an amenable number.

31690978841 is a deficient number, since it is larger than the sum of its proper divisors (597943051).

31690978841 is an equidigital number, since it uses as much as digits as its factorization.

31690978841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597943050.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The spelling of 31690978841 in words is "thirty-one billion, six hundred ninety million, nine hundred seventy-eight thousand, eight hundred forty-one".