491709542 has 4 divisors (see below), whose sum is σ = 737564316. Its totient is φ = 245854770.

The previous prime is 491709527. The next prime is 491709553. The reversal of 491709542 is 245907194.

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

It is a self number, because there is not a number n which added to its sum of digits gives 491709542.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122927384 + ... + 122927387.

It is an arithmetic number, because the mean of its divisors is an integer number (184391079).

Almost surely, 2^491709542 is an apocalyptic number.

491709542 is a deficient number, since it is larger than the sum of its proper divisors (245854774).

491709542 is a wasteful number, since it uses less digits than its factorization.

491709542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245854773.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 491709542 is about 22174.5246172269. The cubic root of 491709542 is about 789.2892940581.

The spelling of 491709542 in words is "four hundred ninety-one million, seven hundred nine thousand, five hundred forty-two".