1045731591 has 24 divisors (see below), whose sum is σ = 1604569824. Its totient is φ = 654005760.

The previous prime is 1045731581. The next prime is 1045731607. The reversal of 1045731591 is 1951375401.

It is a happy number.

1045731591 is a `hidden beast` number, since 10 + 4 + 57 + 3 + 1 + 591 = 666.

1045731591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1045731591 - 2⁵ = 1045731559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1045731521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36595 + ... + 58571.

It is an arithmetic number, because the mean of its divisors is an integer number (66857076).

Almost surely, 2^1045731591 is an apocalyptic number.

1045731591 is a deficient number, since it is larger than the sum of its proper divisors (558838233).

1045731591 is a wasteful number, since it uses less digits than its factorization.

1045731591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22311 (or 22308 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 36.

The square root of 1045731591 is about 32337.7734391222. The cubic root of 1045731591 is about 1015.0172179531.

The spelling of 1045731591 in words is "one billion, forty-five million, seven hundred thirty-one thousand, five hundred ninety-one".