77463121 has 2 divisors, whose sum is σ = 77463122. Its totient is φ = 77463120.

The previous prime is 77463119. The next prime is 77463131. The reversal of 77463121 is 12136477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 9235521 = 8260^2 + 3039^2 .

It is a cyclic number.

It is not a de Polignac number, because 77463121 - 2¹ = 77463119 is a prime.

Together with 77463119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77463131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38731560 + 38731561.

It is an arithmetic number, because the mean of its divisors is an integer number (38731561).

Almost surely, 2^77463121 is an apocalyptic number.

77463121 is the 4705-th centered heptagonal number.

It is an amenable number.

77463121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77463121 is an equidigital number, since it uses as much as digits as its factorization.

77463121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 31.

The square root of 77463121 is about 8801.3135951402. The cubic root of 77463121 is about 426.2833109217.

Adding to 77463121 its reverse (12136477), we get a palindrome (89599598).

The spelling of 77463121 in words is "seventy-seven million, four hundred sixty-three thousand, one hundred twenty-one".