76557121 has 4 divisors (see below), whose sum is σ = 76620544. Its totient is φ = 76493700.

The previous prime is 76557101. The next prime is 76557139. The reversal of 76557121 is 12175567.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12175567 = 173 ⋅70379.

It is a cyclic number.

It is not a de Polignac number, because 76557121 - 2¹⁹ = 76032833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76557101) 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, 29865 + ... + 32326.

It is an arithmetic number, because the mean of its divisors is an integer number (19155136).

Almost surely, 2^76557121 is an apocalyptic number.

It is an amenable number.

76557121 is a deficient number, since it is larger than the sum of its proper divisors (63423).

76557121 is a wasteful number, since it uses less digits than its factorization.

76557121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63422.

The product of its digits is 14700, while the sum is 34.

The square root of 76557121 is about 8749.6926231725. The cubic root of 76557121 is about 424.6148686344.

The spelling of 76557121 in words is "seventy-six million, five hundred fifty-seven thousand, one hundred twenty-one".