1249845131 has 4 divisors (see below), whose sum is σ = 1255303200. Its totient is φ = 1244387064.

The previous prime is 1249845127. The next prime is 1249845133. The reversal of 1249845131 is 1315489421.

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 1249845131 - 2² = 1249845127 is a prime.

It is a super-2 number, since 2×1249845131² = 3124225702968814322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249845133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2728691 + ... + 2729148.

It is an arithmetic number, because the mean of its divisors is an integer number (313825800).

Almost surely, 2^1249845131 is an apocalyptic number.

1249845131 is a deficient number, since it is larger than the sum of its proper divisors (5458069).

1249845131 is an equidigital number, since it uses as much as digits as its factorization.

1249845131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5458068.

The product of its digits is 34560, while the sum is 38.

The square root of 1249845131 is about 35353.1488130831. The cubic root of 1249845131 is about 1077.1728558258.

The spelling of 1249845131 in words is "one billion, two hundred forty-nine million, eight hundred forty-five thousand, one hundred thirty-one".