505456401 has 4 divisors (see below), whose sum is σ = 673941872. Its totient is φ = 336970932.

The previous prime is 505456397. The next prime is 505456409. The reversal of 505456401 is 104654505.

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.

It is not a de Polignac number, because 505456401 - 2² = 505456397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505456409) 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, 84242731 + ... + 84242736.

It is an arithmetic number, because the mean of its divisors is an integer number (168485468).

Almost surely, 2^505456401 is an apocalyptic number.

It is an amenable number.

505456401 is a deficient number, since it is larger than the sum of its proper divisors (168485471).

505456401 is a wasteful number, since it uses less digits than its factorization.

505456401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168485470.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 505456401 is about 22482.3575498656. The cubic root of 505456401 is about 796.5772524039.

The spelling of 505456401 in words is "five hundred five million, four hundred fifty-six thousand, four hundred one".