10391190987 has 16 divisors (see below), whose sum is σ = 13930721280. Its totient is φ = 6889622592.

The previous prime is 10391190983. The next prime is 10391191007. The reversal of 10391190987 is 78909119301.

It is a happy number.

It is not a de Polignac number, because 10391190987 - 2² = 10391190983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (10391190983) 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, 726814 + ... + 740972.

It is an arithmetic number, because the mean of its divisors is an integer number (870670080).

Almost surely, 2^10391190987 is an apocalyptic number.

10391190987 is a deficient number, since it is larger than the sum of its proper divisors (3539530293).

10391190987 is a wasteful number, since it uses less digits than its factorization.

10391190987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15482.

The product of its (nonzero) digits is 122472, while the sum is 48.

The spelling of 10391190987 in words is "ten billion, three hundred ninety-one million, one hundred ninety thousand, nine hundred eighty-seven".