991076617 has 2 divisors, whose sum is σ = 991076618. Its totient is φ = 991076616.

The previous prime is 991076579. The next prime is 991076621. The reversal of 991076617 is 716670199.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 819047161 + 172029456 = 28619^2 + 13116^2 .

It is a cyclic number.

It is not a de Polignac number, because 991076617 - 2¹¹ = 991074569 is a prime.

It is not a weakly prime, because it can be changed into another prime (991076687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 495538308 + 495538309.

It is an arithmetic number, because the mean of its divisors is an integer number (495538309).

Almost surely, 2^991076617 is an apocalyptic number.

It is an amenable number.

991076617 is a deficient number, since it is larger than the sum of its proper divisors (1).

991076617 is an equidigital number, since it uses as much as digits as its factorization.

991076617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 991076617 is about 31481.3693634823. The cubic root of 991076617 is about 997.0166474586.

The spelling of 991076617 in words is "nine hundred ninety-one million, seventy-six thousand, six hundred seventeen".