505923691 has 16 divisors (see below), whose sum is σ = 632890048. Its totient is φ = 393724800.

The previous prime is 505923673. The next prime is 505923707. The reversal of 505923691 is 196329505.

It is a happy number.

It is not a de Polignac number, because 505923691 - 2⁷ = 505923563 is a prime.

It is a super-2 number, since 2×505923691² = 511917562230126962, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (505923611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40020 + ... + 51121.

It is an arithmetic number, because the mean of its divisors is an integer number (39555628).

Almost surely, 2^505923691 is an apocalyptic number.

505923691 is a deficient number, since it is larger than the sum of its proper divisors (126966357).

505923691 is a wasteful number, since it uses less digits than its factorization.

505923691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91222.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 505923691 is about 22492.7475200341. The cubic root of 505923691 is about 796.8226530186.

The spelling of 505923691 in words is "five hundred five million, nine hundred twenty-three thousand, six hundred ninety-one".