77521153 has 4 divisors (see below), whose sum is σ = 77670468. Its totient is φ = 77371840.

The previous prime is 77521133. The next prime is 77521163. The reversal of 77521153 is 35112577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35112577 = 79 ⋅444463.

It can be written as a sum of positive squares in 2 ways, for example, as 18722929 + 58798224 = 4327^2 + 7668^2 .

It is a cyclic number.

It is not a de Polignac number, because 77521153 - 2¹⁷ = 77390081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77521123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73876 + ... + 74917.

It is an arithmetic number, because the mean of its divisors is an integer number (19417617).

Almost surely, 2^77521153 is an apocalyptic number.

It is an amenable number.

77521153 is a deficient number, since it is larger than the sum of its proper divisors (149315).

77521153 is a wasteful number, since it uses less digits than its factorization.

77521153 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149314.

The product of its digits is 7350, while the sum is 31.

The square root of 77521153 is about 8804.6097585299. The cubic root of 77521153 is about 426.3897353199.

The spelling of 77521153 in words is "seventy-seven million, five hundred twenty-one thousand, one hundred fifty-three".