1315993961 has 8 divisors (see below), whose sum is σ = 1331474760. Its totient is φ = 1300528768.

The previous prime is 1315993907. The next prime is 1315993969. The reversal of 1315993961 is 1693995131.

It can be written as a sum of positive squares in 4 ways, for example, as 118336 + 1315875625 = 344^2 + 36275^2 .

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 1315993961 - 2¹⁴ = 1315977577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315993969) 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, 314495 + ... + 318651.

It is an arithmetic number, because the mean of its divisors is an integer number (166434345).

Almost surely, 2^1315993961 is an apocalyptic number.

It is an amenable number.

1315993961 is a deficient number, since it is larger than the sum of its proper divisors (15480799).

1315993961 is an equidigital number, since it uses as much as digits as its factorization.

1315993961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7803.

The product of its digits is 196830, while the sum is 47.

The square root of 1315993961 is about 36276.6310591268. The cubic root of 1315993961 is about 1095.8504713800.

The spelling of 1315993961 in words is "one billion, three hundred fifteen million, nine hundred ninety-three thousand, nine hundred sixty-one".