487473345991 has 4 divisors (see below), whose sum is σ = 487477400584. Its totient is φ = 487469291400.

The previous prime is 487473345979. The next prime is 487473346039. The reversal of 487473345991 is 199543374784.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-487473345991 is a prime.

It is a super-2 number, since 2×487473345991² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (487473345901) 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, 1841265 + ... + 2089306.

It is an arithmetic number, because the mean of its divisors is an integer number (121869350146).

Almost surely, 2^487473345991 is an apocalyptic number.

487473345991 is a deficient number, since it is larger than the sum of its proper divisors (4054593).

487473345991 is a wasteful number, since it uses less digits than its factorization.

487473345991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4054592.

The product of its digits is 91445760, while the sum is 64.

The spelling of 487473345991 in words is "four hundred eighty-seven billion, four hundred seventy-three million, three hundred forty-five thousand, nine hundred ninety-one".