77156121 has 8 divisors (see below), whose sum is σ = 117571264. Its totient is φ = 44089200.

The previous prime is 77156119. The next prime is 77156141. The reversal of 77156121 is 12165177.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77156121 - 2¹ = 77156119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77156111) 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 7 ways as a sum of consecutive naturals, for example, 1837030 + ... + 1837071.

It is an arithmetic number, because the mean of its divisors is an integer number (14696408).

Almost surely, 2^77156121 is an apocalyptic number.

It is an amenable number.

77156121 is a deficient number, since it is larger than the sum of its proper divisors (40415143).

77156121 is a wasteful number, since it uses less digits than its factorization.

77156121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3674111.

The product of its digits is 2940, while the sum is 30.

The square root of 77156121 is about 8783.8557023667. The cubic root of 77156121 is about 425.7194200361.

It can be divided in two parts, 77156 and 121, that added together give a palindrome (77277).

The spelling of 77156121 in words is "seventy-seven million, one hundred fifty-six thousand, one hundred twenty-one".