501491623 has 4 divisors (see below), whose sum is σ = 513723168. Its totient is φ = 489260080.

The previous prime is 501491621. The next prime is 501491657. The reversal of 501491623 is 326194105.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326194105 = 5 ⋅65238821.

It is a cyclic number.

It is not a de Polignac number, because 501491623 - 2¹ = 501491621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501491621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6115711 + ... + 6115792.

It is an arithmetic number, because the mean of its divisors is an integer number (128430792).

Almost surely, 2^501491623 is an apocalyptic number.

501491623 is a deficient number, since it is larger than the sum of its proper divisors (12231545).

501491623 is a wasteful number, since it uses less digits than its factorization.

501491623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12231544.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 501491623 is about 22394.0086407057. The cubic root of 501491623 is about 794.4890103953.

The spelling of 501491623 in words is "five hundred one million, four hundred ninety-one thousand, six hundred twenty-three".