1249781319 has 12 divisors (see below), whose sum is σ = 1872100776. Its totient is φ = 833187384.

The previous prime is 1249781257. The next prime is 1249781329. The reversal of 1249781319 is 9131879421.

It is not a de Polignac number, because 1249781319 - 2⁷ = 1249781191 is a prime.

It is a super-2 number, since 2×1249781319² = 3123906690642759522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249781329) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2571324 + ... + 2571809.

It is an arithmetic number, because the mean of its divisors is an integer number (156008398).

Almost surely, 2^1249781319 is an apocalyptic number.

1249781319 is a deficient number, since it is larger than the sum of its proper divisors (622319457).

1249781319 is an frugal number, since it uses more digits than its factorization.

1249781319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5143148 (or 5143136 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 1249781319 is about 35352.2463076959. The cubic root of 1249781319 is about 1077.1545234947.

The spelling of 1249781319 in words is "one billion, two hundred forty-nine million, seven hundred eighty-one thousand, three hundred nineteen".