491583629 has 4 divisors (see below), whose sum is σ = 493134684. Its totient is φ = 490032576.

The previous prime is 491583593. The next prime is 491583643. The reversal of 491583629 is 926385194.

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 73994404 + 417589225 = 8602^2 + 20435^2 .

It is a cyclic number.

It is not a de Polignac number, because 491583629 - 2²⁸ = 223148173 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491583649) 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, 775052 + ... + 775685.

It is an arithmetic number, because the mean of its divisors is an integer number (123283671).

Almost surely, 2^491583629 is an apocalyptic number.

It is an amenable number.

491583629 is a deficient number, since it is larger than the sum of its proper divisors (1551055).

491583629 is a wasteful number, since it uses less digits than its factorization.

491583629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1551054.

The product of its digits is 466560, while the sum is 47.

The square root of 491583629 is about 22171.6852990475. The cubic root of 491583629 is about 789.2219167018.

The spelling of 491583629 in words is "four hundred ninety-one million, five hundred eighty-three thousand, six hundred twenty-nine".