55738981 has 2 divisors, whose sum is σ = 55738982. Its totient is φ = 55738980.

The previous prime is 55738901. The next prime is 55738993. The reversal of 55738981 is 18983755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41796225 + 13942756 = 6465^2 + 3734^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55738981 is a prime.

It is a super-2 number, since 2×55738981² = 6213668005836722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55738901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27869490 + 27869491.

It is an arithmetic number, because the mean of its divisors is an integer number (27869491).

Almost surely, 2^55738981 is an apocalyptic number.

It is an amenable number.

55738981 is a deficient number, since it is larger than the sum of its proper divisors (1).

55738981 is an equidigital number, since it uses as much as digits as its factorization.

55738981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 46.

The square root of 55738981 is about 7465.8543382523. The cubic root of 55738981 is about 381.9908923022.

The spelling of 55738981 in words is "fifty-five million, seven hundred thirty-eight thousand, nine hundred eighty-one".