772645381 has 2 divisors, whose sum is σ = 772645382. Its totient is φ = 772645380.

The previous prime is 772645343. The next prime is 772645439. The reversal of 772645381 is 183546277.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 421645156 + 351000225 = 20534^2 + 18735^2 .

It is an emirp because it is prime and its reverse (183546277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 772645381 - 2¹³ = 772637189 is a prime.

It is a super-2 number, since 2×772645381² = 1193961769561270322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (772645331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 386322690 + 386322691.

It is an arithmetic number, because the mean of its divisors is an integer number (386322691).

Almost surely, 2^772645381 is an apocalyptic number.

It is an amenable number.

772645381 is a deficient number, since it is larger than the sum of its proper divisors (1).

772645381 is an equidigital number, since it uses as much as digits as its factorization.

772645381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 282240, while the sum is 43.

The square root of 772645381 is about 27796.4994378789. The cubic root of 772645381 is about 917.6140843668.

The spelling of 772645381 in words is "seven hundred seventy-two million, six hundred forty-five thousand, three hundred eighty-one".