451621994 has 4 divisors (see below), whose sum is σ = 677432994. Its totient is φ = 225810996.

The previous prime is 451621987. The next prime is 451621999. The reversal of 451621994 is 499126154.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 373069225 + 78552769 = 19315^2 + 8863^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (451621999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112905497 + ... + 112905500.

Almost surely, 2^451621994 is an apocalyptic number.

451621994 is a deficient number, since it is larger than the sum of its proper divisors (225811000).

451621994 is a wasteful number, since it uses less digits than its factorization.

451621994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225810999.

The product of its digits is 77760, while the sum is 41.

The square root of 451621994 is about 21251.3998127182. The cubic root of 451621994 is about 767.2290315859.

The spelling of 451621994 in words is "four hundred fifty-one million, six hundred twenty-one thousand, nine hundred ninety-four".