77481591 has 16 divisors (see below), whose sum is σ = 116588160. Its totient is φ = 45338720.

The previous prime is 77481577. The next prime is 77481629. The reversal of 77481591 is 19518477.

It is a cyclic number.

It is not a de Polignac number, because 77481591 - 2⁵ = 77481559 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77481191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39525 + ... + 41438.

It is an arithmetic number, because the mean of its divisors is an integer number (7286760).

Almost surely, 2^77481591 is an apocalyptic number.

77481591 is a deficient number, since it is larger than the sum of its proper divisors (39106569).

77481591 is a wasteful number, since it uses less digits than its factorization.

77481591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81006.

The product of its digits is 70560, while the sum is 42.

The square root of 77481591 is about 8802.3628077920. The cubic root of 77481591 is about 426.3171886645.

It can be divided in two parts, 7748 and 1591, that added together give a palindrome (9339).

The spelling of 77481591 in words is "seventy-seven million, four hundred eighty-one thousand, five hundred ninety-one".