77451481 has 2 divisors, whose sum is σ = 77451482. Its totient is φ = 77451480.

The previous prime is 77451469. The next prime is 77451503. The reversal of 77451481 is 18415477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44675856 + 32775625 = 6684^2 + 5725^2 .

It is an emirp because it is prime and its reverse (18415477) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77451481 - 2⁹ = 77450969 is a prime.

It is a super-2 number, since 2×77451481² = 11997463818186722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77451481.

It is not a weakly prime, because it can be changed into another prime (77451401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38725740 + 38725741.

It is an arithmetic number, because the mean of its divisors is an integer number (38725741).

Almost surely, 2^77451481 is an apocalyptic number.

It is an amenable number.

77451481 is a deficient number, since it is larger than the sum of its proper divisors (1).

77451481 is an equidigital number, since it uses as much as digits as its factorization.

77451481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31360, while the sum is 37.

The square root of 77451481 is about 8800.6523053692. The cubic root of 77451481 is about 426.2619580240.

The spelling of 77451481 in words is "seventy-seven million, four hundred fifty-one thousand, four hundred eighty-one".