77161213 has 2 divisors, whose sum is σ = 77161214. Its totient is φ = 77161212.

The previous prime is 77161187. The next prime is 77161237. The reversal of 77161213 is 31216177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73307844 + 3853369 = 8562^2 + 1963^2 .

It is an emirp because it is prime and its reverse (31216177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77161213 - 2¹⁷ = 77030141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77161313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38580606 + 38580607.

It is an arithmetic number, because the mean of its divisors is an integer number (38580607).

Almost surely, 2^77161213 is an apocalyptic number.

It is an amenable number.

77161213 is a deficient number, since it is larger than the sum of its proper divisors (1).

77161213 is an equidigital number, since it uses as much as digits as its factorization.

77161213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1764, while the sum is 28.

The square root of 77161213 is about 8784.1455475191. The cubic root of 77161213 is about 425.7287850982.

It can be divided in two parts, 7 and 7161213, that added together give a triangular number (7161220 = T₃₇₈₄).

The spelling of 77161213 in words is "seventy-seven million, one hundred sixty-one thousand, two hundred thirteen".