505157731 has 12 divisors (see below), whose sum is σ = 575798520. Its totient is φ = 441754560.

The previous prime is 505157729. The next prime is 505157753. The reversal of 505157731 is 137751505.

It is not a de Polignac number, because 505157731 - 2¹ = 505157729 is a prime.

It is a super-2 number, since 2×505157731² = 510368666378136722, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (505157791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 75450 + ... + 81871.

It is an arithmetic number, because the mean of its divisors is an integer number (47983210).

Almost surely, 2^505157731 is an apocalyptic number.

505157731 is a deficient number, since it is larger than the sum of its proper divisors (70640789).

505157731 is a wasteful number, since it uses less digits than its factorization.

505157731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157366 (or 157353 counting only the distinct ones).

The product of its (nonzero) digits is 18375, while the sum is 34.

The square root of 505157731 is about 22475.7142489399. The cubic root of 505157731 is about 796.4203245243.

The spelling of 505157731 in words is "five hundred five million, one hundred fifty-seven thousand, seven hundred thirty-one".