1299912981 has 8 divisors (see below), whose sum is σ = 1770094464. Its totient is φ = 848170080.

The previous prime is 1299912979. The next prime is 1299912997. The reversal of 1299912981 is 1892199921.

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

It is not a de Polignac number, because 1299912981 - 2¹ = 1299912979 is a prime.

It is a super-2 number, since 2×1299912981² = 3379547516344612722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299912931) 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, 4609480 + ... + 4609761.

It is an arithmetic number, because the mean of its divisors is an integer number (221261808).

Almost surely, 2^1299912981 is an apocalyptic number.

It is an amenable number.

1299912981 is a deficient number, since it is larger than the sum of its proper divisors (470181483).

1299912981 is an equidigital number, since it uses as much as digits as its factorization.

1299912981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9219291.

The product of its digits is 209952, while the sum is 51.

The square root of 1299912981 is about 36054.3059980358. The cubic root of 1299912981 is about 1091.3685307441.

The spelling of 1299912981 in words is "one billion, two hundred ninety-nine million, nine hundred twelve thousand, nine hundred eighty-one".