772873561 has 2 divisors, whose sum is σ = 772873562. Its totient is φ = 772873560.

The previous prime is 772873559. The next prime is 772873603. The reversal of 772873561 is 165378277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 717221961 + 55651600 = 26781^2 + 7460^2 .

It is an emirp because it is prime and its reverse (165378277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 772873561 - 2¹ = 772873559 is a prime.

Together with 772873559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (772873861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386436780 + 386436781.

It is an arithmetic number, because the mean of its divisors is an integer number (386436781).

Almost surely, 2^772873561 is an apocalyptic number.

It is an amenable number.

772873561 is a deficient number, since it is larger than the sum of its proper divisors (1).

772873561 is an equidigital number, since it uses as much as digits as its factorization.

772873561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 493920, while the sum is 46.

The square root of 772873561 is about 27800.6036085550. The cubic root of 772873561 is about 917.7044063432.

The spelling of 772873561 in words is "seven hundred seventy-two million, eight hundred seventy-three thousand, five hundred sixty-one".