991279629 has 12 divisors (see below), whose sum is σ = 1451463676. Its totient is φ = 651799872.

The previous prime is 991279607. The next prime is 991279649. The reversal of 991279629 is 926972199.

991279629 is a `hidden beast` number, since 9 + 9 + 1 + 2 + 7 + 9 + 629 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 789497604 + 201782025 = 28098^2 + 14205^2 .

It is not a de Polignac number, because 991279629 - 2⁷ = 991279501 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991279649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 753742 + ... + 755055.

Almost surely, 2^991279629 is an apocalyptic number.

It is an amenable number.

991279629 is a deficient number, since it is larger than the sum of its proper divisors (460184047).

991279629 is a wasteful number, since it uses less digits than its factorization.

991279629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508876 (or 1508873 counting only the distinct ones).

The product of its digits is 1102248, while the sum is 54.

The square root of 991279629 is about 31484.5935181002. The cubic root of 991279629 is about 997.0847190626.

The spelling of 991279629 in words is "nine hundred ninety-one million, two hundred seventy-nine thousand, six hundred twenty-nine".