991076647 has 16 divisors (see below), whose sum is σ = 1129324032. Its totient is φ = 860933920.

The previous prime is 991076623. The next prime is 991076683. The reversal of 991076647 is 746670199.

It is not a de Polignac number, because 991076647 - 2⁷ = 991076519 is a prime.

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 991076647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991076617) 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, 473838 + ... + 475924.

It is an arithmetic number, because the mean of its divisors is an integer number (70582752).

Almost surely, 2^991076647 is an apocalyptic number.

991076647 is the 16828-th centered heptagonal number.

991076647 is a deficient number, since it is larger than the sum of its proper divisors (138247385).

991076647 is a wasteful number, since it uses less digits than its factorization.

991076647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998.

The product of its (nonzero) digits is 571536, while the sum is 49.

The square root of 991076647 is about 31481.3698399546. The cubic root of 991076647 is about 997.0166575186.

The spelling of 991076647 in words is "nine hundred ninety-one million, seventy-six thousand, six hundred forty-seven".