77355121 has 2 divisors, whose sum is σ = 77355122. Its totient is φ = 77355120.

The previous prime is 77355119. The next prime is 77355127. The reversal of 77355121 is 12155377.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74909025 + 2446096 = 8655^2 + 1564^2 .

It is a cyclic number.

It is not a de Polignac number, because 77355121 - 2¹ = 77355119 is a prime.

Together with 77355119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77355127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38677560 + 38677561.

It is an arithmetic number, because the mean of its divisors is an integer number (38677561).

Almost surely, 2^77355121 is an apocalyptic number.

It is an amenable number.

77355121 is a deficient number, since it is larger than the sum of its proper divisors (1).

77355121 is an equidigital number, since it uses as much as digits as its factorization.

77355121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7350, while the sum is 31.

The square root of 77355121 is about 8795.1760073349. The cubic root of 77355121 is about 426.0851090358.

The spelling of 77355121 in words is "seventy-seven million, three hundred fifty-five thousand, one hundred twenty-one".