48815981 has 2 divisors, whose sum is σ = 48815982. Its totient is φ = 48815980.

The previous prime is 48815969. The next prime is 48815983. The reversal of 48815981 is 18951884.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34633225 + 14182756 = 5885^2 + 3766^2 .

It is a cyclic number.

It is not a de Polignac number, because 48815981 - 2¹⁰ = 48814957 is a prime.

It is a super-2 number, since 2×48815981² = 4766000001984722, which contains 22 as substring.

Together with 48815983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (48815983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24407990 + 24407991.

It is an arithmetic number, because the mean of its divisors is an integer number (24407991).

Almost surely, 2^48815981 is an apocalyptic number.

It is an amenable number.

48815981 is a deficient number, since it is larger than the sum of its proper divisors (1).

48815981 is an equidigital number, since it uses as much as digits as its factorization.

48815981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 92160, while the sum is 44.

The square root of 48815981 is about 6986.8434217463. The cubic root of 48815981 is about 365.4719135193.

The spelling of 48815981 in words is "forty-eight million, eight hundred fifteen thousand, nine hundred eighty-one".