491519994 has 32 divisors (see below), whose sum is σ = 1124661120. Its totient is φ = 140285952.

The previous prime is 491519989. The next prime is 491519999. The reversal of 491519994 is 499915194.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (491519989) and next prime (491519999).

It is not an unprimeable number, because it can be changed into a prime (491519999) 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, 37722 + ... + 49050.

It is an arithmetic number, because the mean of its divisors is an integer number (35145660).

Almost surely, 2^491519994 is an apocalyptic number.

491519994 is an abundant number, since it is smaller than the sum of its proper divisors (633141126).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

491519994 is a wasteful number, since it uses less digits than its factorization.

491519994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12374.

The product of its digits is 524880, while the sum is 51.

The square root of 491519994 is about 22170.2502015652. The cubic root of 491519994 is about 789.1878605745.

The spelling of 491519994 in words is "four hundred ninety-one million, five hundred nineteen thousand, nine hundred ninety-four".