1315501999 has 4 divisors (see below), whose sum is σ = 1503430864. Its totient is φ = 1127573136.

The previous prime is 1315501981. The next prime is 1315502039. The reversal of 1315501999 is 9991055131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1315501999 - 2²⁷ = 1181284271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315501909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93964422 + ... + 93964435.

It is an arithmetic number, because the mean of its divisors is an integer number (375857716).

Almost surely, 2^1315501999 is an apocalyptic number.

1315501999 is a deficient number, since it is larger than the sum of its proper divisors (187928865).

1315501999 is an equidigital number, since it uses as much as digits as its factorization.

1315501999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187928864.

The product of its (nonzero) digits is 54675, while the sum is 43.

The square root of 1315501999 is about 36269.8497239787. The cubic root of 1315501999 is about 1095.7138993289.

The spelling of 1315501999 in words is "one billion, three hundred fifteen million, five hundred one thousand, nine hundred ninety-nine".