451991749 has 24 divisors (see below), whose sum is σ = 525530880. Its totient is φ = 387816000.

The previous prime is 451991723. The next prime is 451991753. The reversal of 451991749 is 947199154.

It is not a de Polignac number, because 451991749 - 2⁹ = 451991237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451991549) 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, 152322 + ... + 155260.

It is an arithmetic number, because the mean of its divisors is an integer number (21897120).

Almost surely, 2^451991749 is an apocalyptic number.

It is an amenable number.

451991749 is a deficient number, since it is larger than the sum of its proper divisors (73539131).

451991749 is a wasteful number, since it uses less digits than its factorization.

451991749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033 (or 3022 counting only the distinct ones).

The product of its digits is 408240, while the sum is 49.

The square root of 451991749 is about 21260.0975773866. The cubic root of 451991749 is about 767.4383581089.

The spelling of 451991749 in words is "four hundred fifty-one million, nine hundred ninety-one thousand, seven hundred forty-nine".