491619529 has 4 divisors (see below), whose sum is σ = 492714900. Its totient is φ = 490524160.

The previous prime is 491619521. The next prime is 491619533. The reversal of 491619529 is 925916194.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 105575625 + 386043904 = 10275^2 + 19648^2 .

It is a cyclic number.

It is not a de Polignac number, because 491619529 - 2³ = 491619521 is a prime.

It is a super-2 number, since 2×491619529² = 483379522588363682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491619521) 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, 547012 + ... + 547909.

It is an arithmetic number, because the mean of its divisors is an integer number (123178725).

Almost surely, 2^491619529 is an apocalyptic number.

It is an amenable number.

491619529 is a deficient number, since it is larger than the sum of its proper divisors (1095371).

491619529 is a wasteful number, since it uses less digits than its factorization.

491619529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095370.

The product of its digits is 174960, while the sum is 46.

The square root of 491619529 is about 22172.4948754081. The cubic root of 491619529 is about 789.2411283377.

The spelling of 491619529 in words is "four hundred ninety-one million, six hundred nineteen thousand, five hundred twenty-nine".