1249342861 has 16 divisors (see below), whose sum is σ = 1376863488. Its totient is φ = 1126411200.

The previous prime is 1249342817. The next prime is 1249342901. The reversal of 1249342861 is 1682439421.

It is a cyclic number.

It is not a de Polignac number, because 1249342861 - 2²⁷ = 1115125133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1249343861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 347091 + ... + 350671.

It is an arithmetic number, because the mean of its divisors is an integer number (86053968).

Almost surely, 2^1249342861 is an apocalyptic number.

It is an amenable number.

1249342861 is a deficient number, since it is larger than the sum of its proper divisors (127520627).

1249342861 is a wasteful number, since it uses less digits than its factorization.

1249342861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4212.

The product of its digits is 82944, while the sum is 40.

The square root of 1249342861 is about 35346.0444887402. The cubic root of 1249342861 is about 1077.0285435194.

The spelling of 1249342861 in words is "one billion, two hundred forty-nine million, three hundred forty-two thousand, eight hundred sixty-one".