76429981 has 2 divisors, whose sum is σ = 76429982. Its totient is φ = 76429980.

The previous prime is 76429979. The next prime is 76430041. The reversal of 76429981 is 18992467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50765625 + 25664356 = 7125^2 + 5066^2 .

It is a cyclic number.

It is not a de Polignac number, because 76429981 - 2¹ = 76429979 is a prime.

It is a super-2 number, since 2×76429981² = 11683083991320722, which contains 22 as substring.

Together with 76429979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (76429921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38214990 + 38214991.

It is an arithmetic number, because the mean of its divisors is an integer number (38214991).

Almost surely, 2^76429981 is an apocalyptic number.

It is an amenable number.

76429981 is a deficient number, since it is larger than the sum of its proper divisors (1).

76429981 is an equidigital number, since it uses as much as digits as its factorization.

76429981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 46.

The square root of 76429981 is about 8742.4242061341. The cubic root of 76429981 is about 424.3796828182.

The spelling of 76429981 in words is "seventy-six million, four hundred twenty-nine thousand, nine hundred eighty-one".