77513121 has 12 divisors (see below), whose sum is σ = 127958272. Its totient is φ = 44293176.

The previous prime is 77513101. The next prime is 77513129. The reversal of 77513121 is 12131577.

It is a happy number.

It is not a de Polignac number, because 77513121 - 2⁵ = 77513089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77513129) 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, 615121 + ... + 615246.

Almost surely, 2^77513121 is an apocalyptic number.

It is an amenable number.

77513121 is a deficient number, since it is larger than the sum of its proper divisors (50445151).

77513121 is a wasteful number, since it uses less digits than its factorization.

77513121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230380 (or 1230377 counting only the distinct ones).

The product of its digits is 1470, while the sum is 27.

The square root of 77513121 is about 8804.1536220127. The cubic root of 77513121 is about 426.3750086700.

Adding to 77513121 its reverse (12131577), we get a palindrome (89644698).

The spelling of 77513121 in words is "seventy-seven million, five hundred thirteen thousand, one hundred twenty-one".