772806421 has 2 divisors, whose sum is σ = 772806422. Its totient is φ = 772806420.

The previous prime is 772806401. The next prime is 772806427. The reversal of 772806421 is 124608277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 710222500 + 62583921 = 26650^2 + 7911^2 .

It is a cyclic number.

It is not a de Polignac number, because 772806421 - 2⁵ = 772806389 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (772806427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386403210 + 386403211.

It is an arithmetic number, because the mean of its divisors is an integer number (386403211).

Almost surely, 2^772806421 is an apocalyptic number.

It is an amenable number.

772806421 is a deficient number, since it is larger than the sum of its proper divisors (1).

772806421 is an equidigital number, since it uses as much as digits as its factorization.

772806421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 772806421 is about 27799.3960545908. The cubic root of 772806421 is about 917.6778317255.

The spelling of 772806421 in words is "seven hundred seventy-two million, eight hundred six thousand, four hundred twenty-one".