1249889971 has 4 divisors (see below), whose sum is σ = 1363516344. Its totient is φ = 1136263600.

The previous prime is 1249889969. The next prime is 1249889983. The reversal of 1249889971 is 1799889421.

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 1249889971 - 2¹ = 1249889969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1249889951) 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, 56813170 + ... + 56813191.

It is an arithmetic number, because the mean of its divisors is an integer number (340879086).

Almost surely, 2^1249889971 is an apocalyptic number.

1249889971 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1249889971 is a deficient number, since it is larger than the sum of its proper divisors (113626373).

1249889971 is a wasteful number, since it uses less digits than its factorization.

1249889971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113626372.

The product of its digits is 2612736, while the sum is 58.

The square root of 1249889971 is about 35353.7829800433. The cubic root of 1249889971 is about 1077.1857373826.

The spelling of 1249889971 in words is "one billion, two hundred forty-nine million, eight hundred eighty-nine thousand, nine hundred seventy-one".