501698989 has 4 divisors (see below), whose sum is σ = 547308000. Its totient is φ = 456089980.

The previous prime is 501698983. The next prime is 501698999. The reversal of 501698989 is 989896105.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 501698989 - 2⁷ = 501698861 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (501698983) 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, 22804489 + ... + 22804510.

It is an arithmetic number, because the mean of its divisors is an integer number (136827000).

Almost surely, 2^501698989 is an apocalyptic number.

It is an amenable number.

501698989 is a deficient number, since it is larger than the sum of its proper divisors (45609011).

501698989 is a wasteful number, since it uses less digits than its factorization.

501698989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45609010.

The product of its (nonzero) digits is 1399680, while the sum is 55.

The square root of 501698989 is about 22398.6381059206. The cubic root of 501698989 is about 794.5985019586.

The spelling of 501698989 in words is "five hundred one million, six hundred ninety-eight thousand, nine hundred eighty-nine".