780652091 has 2 divisors, whose sum is σ = 780652092. Its totient is φ = 780652090.

The previous prime is 780652079. The next prime is 780652123. The reversal of 780652091 is 190256087.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 780652091 - 2⁶ = 780652027 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (780652051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390326045 + 390326046.

It is an arithmetic number, because the mean of its divisors is an integer number (390326046).

Almost surely, 2^780652091 is an apocalyptic number.

780652091 is a deficient number, since it is larger than the sum of its proper divisors (1).

780652091 is an equidigital number, since it uses as much as digits as its factorization.

780652091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 780652091 is about 27940.1519501953. The cubic root of 780652091 is about 920.7728583659.

The spelling of 780652091 in words is "seven hundred eighty million, six hundred fifty-two thousand, ninety-one".