1311202987 has 4 divisors (see below), whose sum is σ = 1335942720. Its totient is φ = 1286463256.

The previous prime is 1311202969. The next prime is 1311202993. The reversal of 1311202987 is 7892021131.

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 1311202987 - 2²³ = 1302814379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311202687) 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, 12369787 + ... + 12369892.

It is an arithmetic number, because the mean of its divisors is an integer number (333985680).

Almost surely, 2^1311202987 is an apocalyptic number.

1311202987 is a deficient number, since it is larger than the sum of its proper divisors (24739733).

1311202987 is an equidigital number, since it uses as much as digits as its factorization.

1311202987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24739732.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 1311202987 is about 36210.5369609455. The cubic root of 1311202987 is about 1094.5190125672.

The spelling of 1311202987 in words is "one billion, three hundred eleven million, two hundred two thousand, nine hundred eighty-seven".