920391779 has 2 divisors, whose sum is σ = 920391780. Its totient is φ = 920391778.

The previous prime is 920391757. The next prime is 920391803. The reversal of 920391779 is 977193029.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 920391779 - 2⁸ = 920391523 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (920391079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 460195889 + 460195890.

It is an arithmetic number, because the mean of its divisors is an integer number (460195890).

Almost surely, 2^920391779 is an apocalyptic number.

920391779 is a deficient number, since it is larger than the sum of its proper divisors (1).

920391779 is an equidigital number, since it uses as much as digits as its factorization.

920391779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 214326, while the sum is 47.

The square root of 920391779 is about 30337.9593743548. The cubic root of 920391779 is about 972.7268645530.

The spelling of 920391779 in words is "nine hundred twenty million, three hundred ninety-one thousand, seven hundred seventy-nine".