77243941 has 2 divisors, whose sum is σ = 77243942. Its totient is φ = 77243940.

The previous prime is 77243863. The next prime is 77243951. The reversal of 77243941 is 14934277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76055841 + 1188100 = 8721^2 + 1090^2 .

It is an emirp because it is prime and its reverse (14934277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77243941 - 2¹¹ = 77241893 is a prime.

It is a super-2 number, since 2×77243941² = 11933252842422962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77243941.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77243951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38621970 + 38621971.

It is an arithmetic number, because the mean of its divisors is an integer number (38621971).

Almost surely, 2^77243941 is an apocalyptic number.

It is an amenable number.

77243941 is a deficient number, since it is larger than the sum of its proper divisors (1).

77243941 is an equidigital number, since it uses as much as digits as its factorization.

77243941 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 77243941 is about 8788.8532243974. The cubic root of 77243941 is about 425.8808784025.

The spelling of 77243941 in words is "seventy-seven million, two hundred forty-three thousand, nine hundred forty-one".