1320881257 has 8 divisors (see below), whose sum is σ = 1329362496. Its totient is φ = 1312418352.

The previous prime is 1320881209. The next prime is 1320881291. The reversal of 1320881257 is 7521880231.

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

It is a cyclic number.

It is not a de Polignac number, because 1320881257 - 2¹⁵ = 1320848489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320881207) 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, 158058 + ... + 166204.

It is an arithmetic number, because the mean of its divisors is an integer number (166170312).

Almost surely, 2^1320881257 is an apocalyptic number.

It is an amenable number.

1320881257 is a deficient number, since it is larger than the sum of its proper divisors (8481239).

1320881257 is an equidigital number, since it uses as much as digits as its factorization.

1320881257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9167.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 1320881257 is about 36343.9301259509. The cubic root of 1320881257 is about 1097.2053735631.

The spelling of 1320881257 in words is "one billion, three hundred twenty million, eight hundred eighty-one thousand, two hundred fifty-seven".