77381461 has 4 divisors (see below), whose sum is σ = 77589292. Its totient is φ = 77173632.

The previous prime is 77381443. The next prime is 77381477. The reversal of 77381461 is 16418377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16418377 = 3697 ⋅4441.

It can be written as a sum of positive squares in 2 ways, for example, as 32558436 + 44823025 = 5706^2 + 6695^2 .

It is a cyclic number.

It is not a de Polignac number, because 77381461 - 2¹¹ = 77379413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77381461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77381761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103356 + ... + 104101.

It is an arithmetic number, because the mean of its divisors is an integer number (19397323).

Almost surely, 2^77381461 is an apocalyptic number.

It is an amenable number.

77381461 is a deficient number, since it is larger than the sum of its proper divisors (207831).

77381461 is a wasteful number, since it uses less digits than its factorization.

77381461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207830.

The product of its digits is 28224, while the sum is 37.

The square root of 77381461 is about 8796.6732916484. The cubic root of 77381461 is about 426.1334652748.

The spelling of 77381461 in words is "seventy-seven million, three hundred eighty-one thousand, four hundred sixty-one".