451997819 has 32 divisors (see below), whose sum is σ = 593099136. Its totient is φ = 334264320.

The previous prime is 451997807. The next prime is 451997827. The reversal of 451997819 is 918799154.

It is a de Polignac number, because none of the positive numbers 2^k-451997819 is a prime.

It is a super-2 number, since 2×451997819² = 408604056761513522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (451997869) 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 31 ways as a sum of consecutive naturals, for example, 241949 + ... + 243809.

It is an arithmetic number, because the mean of its divisors is an integer number (18534348).

Almost surely, 2^451997819 is an apocalyptic number.

451997819 is a deficient number, since it is larger than the sum of its proper divisors (141101317).

451997819 is a wasteful number, since it uses less digits than its factorization.

451997819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2055.

The product of its digits is 816480, while the sum is 53.

The square root of 451997819 is about 21260.2403326021. The cubic root of 451997819 is about 767.4417935182.

The spelling of 451997819 in words is "four hundred fifty-one million, nine hundred ninety-seven thousand, eight hundred nineteen".