451118981 has 4 divisors (see below), whose sum is σ = 451168032. Its totient is φ = 451069932.

The previous prime is 451118971. The next prime is 451118999. The reversal of 451118981 is 189811154.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-451118981 is a prime.

It is a super-2 number, since 2×451118981² = 407016670036956722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (451118971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6131 + ... + 30656.

It is an arithmetic number, because the mean of its divisors is an integer number (112792008).

Almost surely, 2^451118981 is an apocalyptic number.

451118981 is the 12263-rd octagonal number.

It is an amenable number.

451118981 is a deficient number, since it is larger than the sum of its proper divisors (49051).

451118981 is a wasteful number, since it uses less digits than its factorization.

451118981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49050.

The product of its digits is 11520, while the sum is 38.

The square root of 451118981 is about 21239.5616951010. The cubic root of 451118981 is about 766.9440812283.

The spelling of 451118981 in words is "four hundred fifty-one million, one hundred eighteen thousand, nine hundred eighty-one".