1254291891 has 16 divisors (see below), whose sum is σ = 1682104320. Its totient is φ = 831348800.

The previous prime is 1254291881. The next prime is 1254291901. The reversal of 1254291891 is 1981924521.

It is an interprime number because it is at equal distance from previous prime (1254291881) and next prime (1254291901).

It is a cyclic number.

It is not a de Polignac number, because 1254291891 - 2¹⁰ = 1254290867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1254291881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 803770 + ... + 805328.

It is an arithmetic number, because the mean of its divisors is an integer number (105131520).

Almost surely, 2^1254291891 is an apocalyptic number.

1254291891 is a deficient number, since it is larger than the sum of its proper divisors (427812429).

1254291891 is a wasteful number, since it uses less digits than its factorization.

1254291891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2946.

The product of its digits is 51840, while the sum is 42.

The square root of 1254291891 is about 35415.9835526278. The cubic root of 1254291891 is about 1078.4488165126.

The spelling of 1254291891 in words is "one billion, two hundred fifty-four million, two hundred ninety-one thousand, eight hundred ninety-one".