1249641019 has 4 divisors (see below), whose sum is σ = 1363244760. Its totient is φ = 1136037280.

The previous prime is 1249640971. The next prime is 1249641047. The reversal of 1249641019 is 9101469421.

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 1249641019 - 2¹⁹ = 1249116731 is a prime.

It is a super-2 number, since 2×1249641019² = 3123205352734716722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249642019) 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, 56801854 + ... + 56801875.

It is an arithmetic number, because the mean of its divisors is an integer number (340811190).

Almost surely, 2^1249641019 is an apocalyptic number.

1249641019 is a deficient number, since it is larger than the sum of its proper divisors (113603741).

1249641019 is a wasteful number, since it uses less digits than its factorization.

1249641019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113603740.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1249641019 is about 35350.2619367948. The cubic root of 1249641019 is about 1077.1142149936.

The spelling of 1249641019 in words is "one billion, two hundred forty-nine million, six hundred forty-one thousand, nineteen".