76858981 has 2 divisors, whose sum is σ = 76858982. Its totient is φ = 76858980.

The previous prime is 76858927. The next prime is 76859033. The reversal of 76858981 is 18985867.

It is an a-pointer prime, because the next prime (76859033) can be obtained adding 76858981 to its sum of digits (52).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65529025 + 11329956 = 8095^2 + 3366^2 .

It is an emirp because it is prime and its reverse (18985867) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 76858981 - 2⁹ = 76858469 is a prime.

It is a super-2 number, since 2×76858981² = 11814605920716722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76858081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38429490 + 38429491.

It is an arithmetic number, because the mean of its divisors is an integer number (38429491).

Almost surely, 2^76858981 is an apocalyptic number.

It is an amenable number.

76858981 is a deficient number, since it is larger than the sum of its proper divisors (1).

76858981 is an equidigital number, since it uses as much as digits as its factorization.

76858981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 52.

The square root of 76858981 is about 8766.9254017586. The cubic root of 76858981 is about 425.1722134839.

The spelling of 76858981 in words is "seventy-six million, eight hundred fifty-eight thousand, nine hundred eighty-one".