975610991 has 2 divisors, whose sum is σ = 975610992. Its totient is φ = 975610990.

The previous prime is 975610963. The next prime is 975611009. The reversal of 975610991 is 199016579.

It is a strong prime.

It is an emirp because it is prime and its reverse (199016579) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-975610991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (975610901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 487805495 + 487805496.

It is an arithmetic number, because the mean of its divisors is an integer number (487805496).

Almost surely, 2^975610991 is an apocalyptic number.

975610991 is a deficient number, since it is larger than the sum of its proper divisors (1).

975610991 is an equidigital number, since it uses as much as digits as its factorization.

975610991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 153090, while the sum is 47.

The square root of 975610991 is about 31234.7721457993. The cubic root of 975610991 is about 991.8033284749.

The spelling of 975610991 in words is "nine hundred seventy-five million, six hundred ten thousand, nine hundred ninety-one".