491401487 has 8 divisors (see below), whose sum is σ = 494718960. Its totient is φ = 488093760.

The previous prime is 491401457. The next prime is 491401489. The reversal of 491401487 is 784104194.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 491401487 - 2⁸ = 491401231 is a prime.

It is a super-2 number, since 2×491401487² = 482950842851622338, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 491401487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491401489) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118013 + ... + 122105.

It is an arithmetic number, because the mean of its divisors is an integer number (61839870).

Almost surely, 2^491401487 is an apocalyptic number.

491401487 is a deficient number, since it is larger than the sum of its proper divisors (3317473).

491401487 is a wasteful number, since it uses less digits than its factorization.

491401487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4873.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 491401487 is about 22167.5773822942. The cubic root of 491401487 is about 789.1244302602.

The spelling of 491401487 in words is "four hundred ninety-one million, four hundred one thousand, four hundred eighty-seven".