1331499731 has 8 divisors (see below), whose sum is σ = 1337064960. Its totient is φ = 1325946888.

The previous prime is 1331499713. The next prime is 1331499737. The reversal of 1331499731 is 1379941331.

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 1331499731 - 2⁶ = 1331499667 is a prime.

It is a super-2 number, since 2×1331499731² = 3545783067306144722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1331499737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255110 + ... + 260276.

It is an arithmetic number, because the mean of its divisors is an integer number (167133120).

Almost surely, 2^1331499731 is an apocalyptic number.

1331499731 is a deficient number, since it is larger than the sum of its proper divisors (5565229).

1331499731 is an equidigital number, since it uses as much as digits as its factorization.

1331499731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6193.

The product of its digits is 61236, while the sum is 41.

The square root of 1331499731 is about 36489.7208950685. The cubic root of 1331499731 is about 1100.1376497165.

Subtracting 1331499731 from its reverse (1379941331), we obtain a square (48441600 = 6960²).

The spelling of 1331499731 in words is "one billion, three hundred thirty-one million, four hundred ninety-nine thousand, seven hundred thirty-one".