1320729951 has 8 divisors (see below), whose sum is σ = 1762074160. Its totient is φ = 879936192.

The previous prime is 1320729941. The next prime is 1320729953. The reversal of 1320729951 is 1599270231.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1320729951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320729953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131980 + ... + 141633.

It is an arithmetic number, because the mean of its divisors is an integer number (220259270).

Almost surely, 2^1320729951 is an apocalyptic number.

1320729951 is a deficient number, since it is larger than the sum of its proper divisors (441344209).

1320729951 is a wasteful number, since it uses less digits than its factorization.

1320729951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275225.

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 1320729951 is about 36341.8484807804. The cubic root of 1320729951 is about 1097.1634772673.

The spelling of 1320729951 in words is "one billion, three hundred twenty million, seven hundred twenty-nine thousand, nine hundred fifty-one".