31651450609 has 4 divisors (see below), whose sum is σ = 32097245760. Its totient is φ = 31205655460.

The previous prime is 31651450603. The next prime is 31651450613. The reversal of 31651450609 is 90605415613.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90605415613 = 176161 ⋅514333.

It is a cyclic number.

It is not a de Polignac number, because 31651450609 - 2⁵ = 31651450577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31651450603) 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, 222897469 + ... + 222897610.

It is an arithmetic number, because the mean of its divisors is an integer number (8024311440).

Almost surely, 2^31651450609 is an apocalyptic number.

It is an amenable number.

31651450609 is a deficient number, since it is larger than the sum of its proper divisors (445795151).

31651450609 is an equidigital number, since it uses as much as digits as its factorization.

31651450609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 445795150.

The product of its (nonzero) digits is 97200, while the sum is 40.

The spelling of 31651450609 in words is "thirty-one billion, six hundred fifty-one million, four hundred fifty thousand, six hundred nine".