77121311 has 2 divisors, whose sum is σ = 77121312. Its totient is φ = 77121310.

The previous prime is 77121271. The next prime is 77121337. The reversal of 77121311 is 11312177.

It is a strong prime.

It is an emirp because it is prime and its reverse (11312177) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77121311 - 2¹⁴ = 77104927 is a prime.

It is a super-2 number, since 2×77121311² = 11895393220717442, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77121371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38560655 + 38560656.

It is an arithmetic number, because the mean of its divisors is an integer number (38560656).

Almost surely, 2^77121311 is an apocalyptic number.

77121311 is a deficient number, since it is larger than the sum of its proper divisors (1).

77121311 is an equidigital number, since it uses as much as digits as its factorization.

77121311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 294, while the sum is 23.

The square root of 77121311 is about 8781.8740027400. The cubic root of 77121311 is about 425.6553874313.

Adding to 77121311 its reverse (11312177), we get a palindrome (88433488).

The spelling of 77121311 in words is "seventy-seven million, one hundred twenty-one thousand, three hundred eleven".