77314381 has 2 divisors, whose sum is σ = 77314382. Its totient is φ = 77314380.

The previous prime is 77314379. The next prime is 77314399. The reversal of 77314381 is 18341377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75516100 + 1798281 = 8690^2 + 1341^2 .

It is a cyclic number.

It is not a de Polignac number, because 77314381 - 2¹ = 77314379 is a prime.

It is a super-2 number, since 2×77314381² = 11955027018826322, which contains 22 as substring.

Together with 77314379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77314361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38657190 + 38657191.

It is an arithmetic number, because the mean of its divisors is an integer number (38657191).

Almost surely, 2^77314381 is an apocalyptic number.

It is an amenable number.

77314381 is a deficient number, since it is larger than the sum of its proper divisors (1).

77314381 is an equidigital number, since it uses as much as digits as its factorization.

77314381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14112, while the sum is 34.

The square root of 77314381 is about 8792.8596599741. The cubic root of 77314381 is about 426.0102949601.

The spelling of 77314381 in words is "seventy-seven million, three hundred fourteen thousand, three hundred eighty-one".