1307220991 has 8 divisors (see below), whose sum is σ = 1337081904. Its totient is φ = 1277552640.

The previous prime is 1307220961. The next prime is 1307220997. The reversal of 1307220991 is 1990227031.

It is a happy number.

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 1307220991 - 2¹⁷ = 1307089919 is a prime.

It is a super-2 number, since 2×1307220991² = 3417653438622044162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1307220997) 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, 34365 + ... + 61606.

It is an arithmetic number, because the mean of its divisors is an integer number (167135238).

Almost surely, 2^1307220991 is an apocalyptic number.

1307220991 is a deficient number, since it is larger than the sum of its proper divisors (29860913).

1307220991 is an equidigital number, since it uses as much as digits as its factorization.

1307220991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96281.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 1307220991 is about 36155.5112119854. The cubic root of 1307220991 is about 1093.4099064475.

The spelling of 1307220991 in words is "one billion, three hundred seven million, two hundred twenty thousand, nine hundred ninety-one".