1250440491 has 16 divisors (see below), whose sum is σ = 1775094048. Its totient is φ = 780249600.

The previous prime is 1250440487. The next prime is 1250440537. The reversal of 1250440491 is 1940440521.

It is not a de Polignac number, because 1250440491 - 2² = 1250440487 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1250440441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58500 + ... + 76961.

It is an arithmetic number, because the mean of its divisors is an integer number (110943378).

Almost surely, 2^1250440491 is an apocalyptic number.

1250440491 is a deficient number, since it is larger than the sum of its proper divisors (524653557).

1250440491 is a wasteful number, since it uses less digits than its factorization.

1250440491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135662.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 1250440491 is about 35361.5679940808. The cubic root of 1250440491 is about 1077.3438647010.

Adding to 1250440491 its sum of digits (30), we get a palindrome (1250440521).

The spelling of 1250440491 in words is "one billion, two hundred fifty million, four hundred forty thousand, four hundred ninety-one".