48251981 has 2 divisors, whose sum is σ = 48251982. Its totient is φ = 48251980.

The previous prime is 48251947. The next prime is 48252013. The reversal of 48251981 is 18915284.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32775625 + 15476356 = 5725^2 + 3934^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-48251981 is a prime.

It is a super-2 number, since 2×48251981² = 4656507340848722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (48251921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24125990 + 24125991.

It is an arithmetic number, because the mean of its divisors is an integer number (24125991).

Almost surely, 2^48251981 is an apocalyptic number.

It is an amenable number.

48251981 is a deficient number, since it is larger than the sum of its proper divisors (1).

48251981 is an equidigital number, since it uses as much as digits as its factorization.

48251981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 38.

The square root of 48251981 is about 6946.3645887615. The cubic root of 48251981 is about 364.0589532377.

The spelling of 48251981 in words is "forty-eight million, two hundred fifty-one thousand, nine hundred eighty-one".