31321234651 has 4 divisors (see below), whose sum is σ = 35795696752. Its totient is φ = 26846772552.

The previous prime is 31321234631. The next prime is 31321234663. The reversal of 31321234651 is 15643212313.

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

It is a cyclic number.

It is not a de Polignac number, because 31321234651 - 2⁵ = 31321234619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321234631) 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, 2237231040 + ... + 2237231053.

It is an arithmetic number, because the mean of its divisors is an integer number (8948924188).

Almost surely, 2^31321234651 is an apocalyptic number.

31321234651 is a deficient number, since it is larger than the sum of its proper divisors (4474462101).

31321234651 is an equidigital number, since it uses as much as digits as its factorization.

31321234651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4474462100.

The product of its digits is 12960, while the sum is 31.

Adding to 31321234651 its reverse (15643212313), we get a palindrome (46964446964).

The spelling of 31321234651 in words is "thirty-one billion, three hundred twenty-one million, two hundred thirty-four thousand, six hundred fifty-one".