53947981 has 2 divisors, whose sum is σ = 53947982. Its totient is φ = 53947980.

The previous prime is 53947913. The next prime is 53947991. The reversal of 53947981 is 18974935.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52345225 + 1602756 = 7235^2 + 1266^2 .

It is a cyclic number.

It is not a de Polignac number, because 53947981 - 2⁷ = 53947853 is a prime.

It is a super-2 number, since 2×53947981² = 5820769307952722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53947991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26973990 + 26973991.

It is an arithmetic number, because the mean of its divisors is an integer number (26973991).

Almost surely, 2^53947981 is an apocalyptic number.

It is an amenable number.

53947981 is a deficient number, since it is larger than the sum of its proper divisors (1).

53947981 is an equidigital number, since it uses as much as digits as its factorization.

53947981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 53947981 is about 7344.9289309019. The cubic root of 53947981 is about 377.8549059138.

The spelling of 53947981 in words is "fifty-three million, nine hundred forty-seven thousand, nine hundred eighty-one".