505551401 has 4 divisors (see below), whose sum is σ = 509410704. Its totient is φ = 501692100.

The previous prime is 505551383. The next prime is 505551407. The reversal of 505551401 is 104155505.

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 a cyclic number.

It is not a de Polignac number, because 505551401 - 2²² = 501357097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505551407) 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, 1929455 + ... + 1929716.

It is an arithmetic number, because the mean of its divisors is an integer number (127352676).

Almost surely, 2^505551401 is an apocalyptic number.

It is an amenable number.

505551401 is a deficient number, since it is larger than the sum of its proper divisors (3859303).

505551401 is a wasteful number, since it uses less digits than its factorization.

505551401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3859302.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 505551401 is about 22484.4702183529. The cubic root of 505551401 is about 796.6271545638.

The spelling of 505551401 in words is "five hundred five million, five hundred fifty-one thousand, four hundred one".