1017991487 has 8 divisors (see below), whose sum is σ = 1043404800. Its totient is φ = 992850264.

The previous prime is 1017991483. The next prime is 1017991531. The reversal of 1017991487 is 7841997101.

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 1017991487 - 2² = 1017991483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1017991483) 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, 60437 + ... + 75422.

It is an arithmetic number, because the mean of its divisors is an integer number (130425600).

Almost surely, 2^1017991487 is an apocalyptic number.

1017991487 is a deficient number, since it is larger than the sum of its proper divisors (25413313).

1017991487 is a wasteful number, since it uses less digits than its factorization.

1017991487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136045.

The product of its (nonzero) digits is 127008, while the sum is 47.

The square root of 1017991487 is about 31905.9788597686. The cubic root of 1017991487 is about 1005.9615516110.

The spelling of 1017991487 in words is "one billion, seventeen million, nine hundred ninety-one thousand, four hundred eighty-seven".