1313131945 has 8 divisors (see below), whose sum is σ = 1626589440. Its totient is φ = 1016618160.

The previous prime is 1313131913. The next prime is 1313131951. The reversal of 1313131945 is 5491313131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1313131945 - 2⁵ = 1313131913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4235755 + ... + 4236064.

It is an arithmetic number, because the mean of its divisors is an integer number (203323680).

Almost surely, 2^1313131945 is an apocalyptic number.

It is an amenable number.

1313131945 is a deficient number, since it is larger than the sum of its proper divisors (313457495).

1313131945 is an equidigital number, since it uses as much as digits as its factorization.

1313131945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8471855.

The product of its digits is 4860, while the sum is 31.

The square root of 1313131945 is about 36237.1624854927. The cubic root of 1313131945 is about 1095.0554783787.

The spelling of 1313131945 in words is "one billion, three hundred thirteen million, one hundred thirty-one thousand, nine hundred forty-five".