137944861 has 2 divisors, whose sum is σ = 137944862. Its totient is φ = 137944860.

The previous prime is 137944819. The next prime is 137944871. The reversal of 137944861 is 168449731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115562500 + 22382361 = 10750^2 + 4731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137944861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137944811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68972430 + 68972431.

It is an arithmetic number, because the mean of its divisors is an integer number (68972431).

Almost surely, 2^137944861 is an apocalyptic number.

It is an amenable number.

137944861 is a deficient number, since it is larger than the sum of its proper divisors (1).

137944861 is an equidigital number, since it uses as much as digits as its factorization.

137944861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 43.

The square root of 137944861 is about 11744.9930183036. The cubic root of 137944861 is about 516.6960902193.

The spelling of 137944861 in words is "one hundred thirty-seven million, nine hundred forty-four thousand, eight hundred sixty-one".