1245131899 has 8 divisors (see below), whose sum is σ = 1377457920. Its totient is φ = 1115994600.

The previous prime is 1245131857. The next prime is 1245131977. The reversal of 1245131899 is 9981315421.

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 1245131899 - 2⁹ = 1245131387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1245131099) 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, 796359 + ... + 797920.

It is an arithmetic number, because the mean of its divisors is an integer number (172182240).

Almost surely, 2^1245131899 is an apocalyptic number.

1245131899 is a deficient number, since it is larger than the sum of its proper divisors (132326021).

1245131899 is a wasteful number, since it uses less digits than its factorization.

1245131899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594361.

The product of its digits is 77760, while the sum is 43.

The square root of 1245131899 is about 35286.4265546966. The cubic root of 1245131899 is about 1075.8171249739.

The spelling of 1245131899 in words is "one billion, two hundred forty-five million, one hundred thirty-one thousand, eight hundred ninety-nine".