77831983 has 2 divisors, whose sum is σ = 77831984. Its totient is φ = 77831982.

The previous prime is 77831959. The next prime is 77831987. The reversal of 77831983 is 38913877.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (38913877) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77831983 - 2⁵ = 77831951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77831987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38915991 + 38915992.

It is an arithmetic number, because the mean of its divisors is an integer number (38915992).

Almost surely, 2^77831983 is an apocalyptic number.

77831983 is a deficient number, since it is larger than the sum of its proper divisors (1).

77831983 is an equidigital number, since it uses as much as digits as its factorization.

77831983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 254016, while the sum is 46.

The square root of 77831983 is about 8822.2436488685. The cubic root of 77831983 is about 426.9588616039.

It can be divided in two parts, 778 and 31983, that added together give a square (32761 = 181²).

The spelling of 77831983 in words is "seventy-seven million, eight hundred thirty-one thousand, nine hundred eighty-three".