499158921 has 16 divisors (see below), whose sum is σ = 682868736. Its totient is φ = 324152976.

The previous prime is 499158883. The next prime is 499158943. The reversal of 499158921 is 129851994.

It is not a de Polignac number, because 499158921 - 2¹⁵ = 499126153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (499158221) 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, 44356 + ... + 54458.

It is an arithmetic number, because the mean of its divisors is an integer number (42679296).

Almost surely, 2^499158921 is an apocalyptic number.

It is an amenable number.

499158921 is a deficient number, since it is larger than the sum of its proper divisors (183709815).

499158921 is a wasteful number, since it uses less digits than its factorization.

499158921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10532.

The product of its digits is 233280, while the sum is 48.

The square root of 499158921 is about 22341.8647610266. The cubic root of 499158921 is about 793.2552329765.

The spelling of 499158921 in words is "four hundred ninety-nine million, one hundred fifty-eight thousand, nine hundred twenty-one".