505920121 has 32 divisors (see below), whose sum is σ = 616366080. Its totient is φ = 405953856.

The previous prime is 505920083. The next prime is 505920131. The reversal of 505920121 is 121029505.

It is not a de Polignac number, because 505920121 - 2²³ = 497531513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505920131) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2228610 + ... + 2228836.

It is an arithmetic number, because the mean of its divisors is an integer number (19261440).

Almost surely, 2^505920121 is an apocalyptic number.

It is an amenable number.

505920121 is a deficient number, since it is larger than the sum of its proper divisors (110445959).

505920121 is a wasteful number, since it uses less digits than its factorization.

505920121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 505920121 is about 22492.6681609808. The cubic root of 505920121 is about 796.8207787811.

Adding to 505920121 its reverse (121029505), we get a palindrome (626949626).

The spelling of 505920121 in words is "five hundred five million, nine hundred twenty thousand, one hundred twenty-one".