505947631 has 4 divisors (see below), whose sum is σ = 578225872. Its totient is φ = 433669392.

The previous prime is 505947623. The next prime is 505947647. The reversal of 505947631 is 136749505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136749505 = 5 ⋅27349901.

It is a cyclic number.

It is not a de Polignac number, because 505947631 - 2³ = 505947623 is a prime.

It is a super-3 number, since 3×505947631³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505947661) 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, 36139110 + ... + 36139123.

It is an arithmetic number, because the mean of its divisors is an integer number (144556468).

Almost surely, 2^505947631 is an apocalyptic number.

505947631 is a deficient number, since it is larger than the sum of its proper divisors (72278241).

505947631 is an equidigital number, since it uses as much as digits as its factorization.

505947631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72278240.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 505947631 is about 22493.2796852749. The cubic root of 505947631 is about 796.8352212075.

The spelling of 505947631 in words is "five hundred five million, nine hundred forty-seven thousand, six hundred thirty-one".