55981837 has 2 divisors, whose sum is σ = 55981838. Its totient is φ = 55981836.

The previous prime is 55981831. The next prime is 55981843. The reversal of 55981837 is 73818955.

It is a balanced prime because it is at equal distance from previous prime (55981831) and next prime (55981843).

It can be written as a sum of positive squares in only one way, i.e., 49294441 + 6687396 = 7021^2 + 2586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55981837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55981831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27990918 + 27990919.

It is an arithmetic number, because the mean of its divisors is an integer number (27990919).

Almost surely, 2^55981837 is an apocalyptic number.

It is an amenable number.

55981837 is a deficient number, since it is larger than the sum of its proper divisors (1).

55981837 is an equidigital number, since it uses as much as digits as its factorization.

55981837 is an evil number, because the sum of its binary digits is even.

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

The square root of 55981837 is about 7482.1011086459. The cubic root of 55981837 is about 382.5448694996.

The spelling of 55981837 in words is "fifty-five million, nine hundred eighty-one thousand, eight hundred thirty-seven".