451681506 has 24 divisors (see below), whose sum is σ = 979056624. Its totient is φ = 150496920.

The previous prime is 451681499. The next prime is 451681507. The reversal of 451681506 is 605186154.

It is not an unprimeable number, because it can be changed into a prime (451681507) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60765 + ... + 67791.

It is an arithmetic number, because the mean of its divisors is an integer number (40794026).

Almost surely, 2^451681506 is an apocalyptic number.

451681506 is an abundant number, since it is smaller than the sum of its proper divisors (527375118).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

451681506 is a wasteful number, since it uses less digits than its factorization.

451681506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10606 (or 10603 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 451681506 is about 21252.7999567116. The cubic root of 451681506 is about 767.2627303645.

The spelling of 451681506 in words is "four hundred fifty-one million, six hundred eighty-one thousand, five hundred six".