77379481 has 2 divisors, whose sum is σ = 77379482. Its totient is φ = 77379480.

The previous prime is 77379479. The next prime is 77379487. The reversal of 77379481 is 18497377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72931600 + 4447881 = 8540^2 + 2109^2 .

It is a cyclic number.

It is not a de Polignac number, because 77379481 - 2¹ = 77379479 is a prime.

It is a super-2 number, since 2×77379481² = 11975168159658722, which contains 22 as substring.

Together with 77379479, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77379487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38689740 + 38689741.

It is an arithmetic number, because the mean of its divisors is an integer number (38689741).

Almost surely, 2^77379481 is an apocalyptic number.

It is an amenable number.

77379481 is a deficient number, since it is larger than the sum of its proper divisors (1).

77379481 is an equidigital number, since it uses as much as digits as its factorization.

77379481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 46.

The square root of 77379481 is about 8796.5607483834. The cubic root of 77379481 is about 426.1298306770.

The spelling of 77379481 in words is "seventy-seven million, three hundred seventy-nine thousand, four hundred eighty-one".