969778819 has 2 divisors, whose sum is σ = 969778820. Its totient is φ = 969778818.

The previous prime is 969778813. The next prime is 969778841. The reversal of 969778819 is 918877969.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 969778819 - 2²⁷ = 835561091 is a prime.

It is a super-2 number, since 2×969778819² = 1880941915562069522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (969778813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 484889409 + 484889410.

It is an arithmetic number, because the mean of its divisors is an integer number (484889410).

Almost surely, 2^969778819 is an apocalyptic number.

969778819 is a deficient number, since it is larger than the sum of its proper divisors (1).

969778819 is an equidigital number, since it uses as much as digits as its factorization.

969778819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13716864, while the sum is 64.

The square root of 969778819 is about 31141.2719553971. The cubic root of 969778819 is about 989.8230541153.

The spelling of 969778819 in words is "nine hundred sixty-nine million, seven hundred seventy-eight thousand, eight hundred nineteen".