77412961 has 4 divisors (see below), whose sum is σ = 79301124. Its totient is φ = 75524800.

The previous prime is 77412949. The next prime is 77412967. The reversal of 77412961 is 16921477.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16921477 = 17 ⋅995381.

It can be written as a sum of positive squares in 2 ways, for example, as 26718561 + 50694400 = 5169^2 + 7120^2 .

It is a cyclic number.

It is not a de Polignac number, because 77412961 - 2¹⁷ = 77281889 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 77412961.

It is not an unprimeable number, because it can be changed into a prime (77412967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944020 + ... + 944101.

It is an arithmetic number, because the mean of its divisors is an integer number (19825281).

Almost surely, 2^77412961 is an apocalyptic number.

It is an amenable number.

77412961 is a deficient number, since it is larger than the sum of its proper divisors (1888163).

77412961 is a wasteful number, since it uses less digits than its factorization.

77412961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888162.

The product of its digits is 21168, while the sum is 37.

The square root of 77412961 is about 8798.4635590539. The cubic root of 77412961 is about 426.1912800838.

The spelling of 77412961 in words is "seventy-seven million, four hundred twelve thousand, nine hundred sixty-one".