451661401 has 2 divisors, whose sum is σ = 451661402. Its totient is φ = 451661400.

The previous prime is 451661381. The next prime is 451661443. The reversal of 451661401 is 104166154.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 372451401 + 79210000 = 19299^2 + 8900^2 .

It is a cyclic number.

It is not a de Polignac number, because 451661401 - 2⁹ = 451660889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 451661401.

It is not a weakly prime, because it can be changed into another prime (451661471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225830700 + 225830701.

It is an arithmetic number, because the mean of its divisors is an integer number (225830701).

Almost surely, 2^451661401 is an apocalyptic number.

It is an amenable number.

451661401 is a deficient number, since it is larger than the sum of its proper divisors (1).

451661401 is an equidigital number, since it uses as much as digits as its factorization.

451661401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 451661401 is about 21252.3269549478. The cubic root of 451661401 is about 767.2513462027.

The spelling of 451661401 in words is "four hundred fifty-one million, six hundred sixty-one thousand, four hundred one".