77616971 has 2 divisors, whose sum is σ = 77616972. Its totient is φ = 77616970.

The previous prime is 77616967. The next prime is 77616997. The reversal of 77616971 is 17961677.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77616971 - 2² = 77616967 is a prime.

It is not a weakly prime, because it can be changed into another prime (77616911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38808485 + 38808486.

It is an arithmetic number, because the mean of its divisors is an integer number (38808486).

Almost surely, 2^77616971 is an apocalyptic number.

77616971 is a deficient number, since it is larger than the sum of its proper divisors (1).

77616971 is an equidigital number, since it uses as much as digits as its factorization.

77616971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 111132, while the sum is 44.

The square root of 77616971 is about 8810.0494323244. The cubic root of 77616971 is about 426.5653389615.

It can be divided in two parts, 77616 and 971, that added together give a palindrome (78587).

The spelling of 77616971 in words is "seventy-seven million, six hundred sixteen thousand, nine hundred seventy-one".