77154921 has 12 divisors (see below), whose sum is σ = 111927348. Its totient is φ = 51214464.

The previous prime is 77154911. The next prime is 77154929. The reversal of 77154921 is 12945177.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9734400 + 67420521 = 3120^2 + 8211^2 .

It is not a de Polignac number, because 77154921 - 2⁷ = 77154793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77154929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16300 + ... + 20493.

It is an arithmetic number, because the mean of its divisors is an integer number (9327279).

Almost surely, 2^77154921 is an apocalyptic number.

It is an amenable number.

77154921 is a deficient number, since it is larger than the sum of its proper divisors (34772427).

77154921 is a wasteful number, since it uses less digits than its factorization.

77154921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37032 (or 37029 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 77154921 is about 8783.7873949681. The cubic root of 77154921 is about 425.7172129701.

The spelling of 77154921 in words is "seventy-seven million, one hundred fifty-four thousand, nine hundred twenty-one".