76840961 has 2 divisors, whose sum is σ = 76840962. Its totient is φ = 76840960.

The previous prime is 76840949. The next prime is 76840993. The reversal of 76840961 is 16904867.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60357361 + 16483600 = 7769^2 + 4060^2 .

It is a cyclic number.

It is not a de Polignac number, because 76840961 - 2²⁶ = 9732097 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (76840931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38420480 + 38420481.

It is an arithmetic number, because the mean of its divisors is an integer number (38420481).

It is a Proth number, since it is equal to 2345 ⋅ 2¹⁵ + 1 and 2345 < 2¹⁵.

Almost surely, 2^76840961 is an apocalyptic number.

It is an amenable number.

76840961 is a deficient number, since it is larger than the sum of its proper divisors (1).

76840961 is an equidigital number, since it uses as much as digits as its factorization.

76840961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 76840961 is about 8765.8976151904. The cubic root of 76840961 is about 425.1389829187.

The spelling of 76840961 in words is "seventy-six million, eight hundred forty thousand, nine hundred sixty-one".