31947146409 has 4 divisors (see below), whose sum is σ = 42596195216. Its totient is φ = 21298097604.

The previous prime is 31947146381. The next prime is 31947146411. The reversal of 31947146409 is 90464174913.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31947146409 - 2¹⁵ = 31947113641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31947146449) 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, 5324524399 + ... + 5324524404.

It is an arithmetic number, because the mean of its divisors is an integer number (10649048804).

Almost surely, 2^31947146409 is an apocalyptic number.

It is an amenable number.

31947146409 is a deficient number, since it is larger than the sum of its proper divisors (10649048807).

31947146409 is a wasteful number, since it uses less digits than its factorization.

31947146409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10649048806.

The product of its (nonzero) digits is 653184, while the sum is 48.

The spelling of 31947146409 in words is "thirty-one billion, nine hundred forty-seven million, one hundred forty-six thousand, four hundred nine".