1326097731 has 24 divisors (see below), whose sum is σ = 2059106304. Its totient is φ = 756922320.

The previous prime is 1326097711. The next prime is 1326097741. The reversal of 1326097731 is 1377906231.

It is a happy number.

It is not a de Polignac number, because 1326097731 - 2¹⁵ = 1326064963 is a prime.

It is a super-2 number, since 2×1326097731² = 3517070384326696722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1326097731.

It is not an unprimeable number, because it can be changed into a prime (1326097711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 141126 + ... + 150228.

It is an arithmetic number, because the mean of its divisors is an integer number (85796096).

Almost surely, 2^1326097731 is an apocalyptic number.

1326097731 is a deficient number, since it is larger than the sum of its proper divisors (733008573).

1326097731 is an equidigital number, since it uses as much as digits as its factorization.

1326097731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10111 (or 10104 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 1326097731 is about 36415.6248195744. The cubic root of 1326097731 is about 1098.6478512566.

The spelling of 1326097731 in words is "one billion, three hundred twenty-six million, ninety-seven thousand, seven hundred thirty-one".