1299521431 has 8 divisors (see below), whose sum is σ = 1401004080. Its totient is φ = 1198255872.

The previous prime is 1299521423. The next prime is 1299521477. The reversal of 1299521431 is 1341259921.

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 1299521431 - 2³ = 1299521423 is a prime.

It is a super-2 number, since 2×1299521431² = 3377511899256575522, 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 (1299521411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41725 + ... + 65878.

It is an arithmetic number, because the mean of its divisors is an integer number (175125510).

Almost surely, 2^1299521431 is an apocalyptic number.

1299521431 is a deficient number, since it is larger than the sum of its proper divisors (101482649).

1299521431 is a wasteful number, since it uses less digits than its factorization.

1299521431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108545.

The product of its digits is 19440, while the sum is 37.

The square root of 1299521431 is about 36048.8755857932. The cubic root of 1299521431 is about 1091.2589418031.

The spelling of 1299521431 in words is "one billion, two hundred ninety-nine million, five hundred twenty-one thousand, four hundred thirty-one".