996721951 has 16 divisors (see below), whose sum is σ = 1136775168. Its totient is φ = 868348800.

The previous prime is 996721939. The next prime is 996721961. The reversal of 996721951 is 159127699.

It is a cyclic number.

It is not a de Polignac number, because 996721951 - 2⁷ = 996721823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 996721895 and 996721904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (996721961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28995 + ... + 53236.

It is an arithmetic number, because the mean of its divisors is an integer number (71048448).

Almost surely, 2^996721951 is an apocalyptic number.

996721951 is a deficient number, since it is larger than the sum of its proper divisors (140053217).

996721951 is a wasteful number, since it uses less digits than its factorization.

996721951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82302.

The product of its digits is 306180, while the sum is 49.

The square root of 996721951 is about 31570.9035505796. The cubic root of 996721951 is about 998.9061208647.

The spelling of 996721951 in words is "nine hundred ninety-six million, seven hundred twenty-one thousand, nine hundred fifty-one".