137618861 has 2 divisors, whose sum is σ = 137618862. Its totient is φ = 137618860.

The previous prime is 137618849. The next prime is 137618903. The reversal of 137618861 is 168816731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137616361 + 2500 = 11731^2 + 50^2 .

It is a cyclic number.

It is not a de Polignac number, because 137618861 - 2¹⁸ = 137356717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is equal to p_7785338 and since 137618861 and 7785338 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137618801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68809430 + 68809431.

It is an arithmetic number, because the mean of its divisors is an integer number (68809431).

Almost surely, 2^137618861 is an apocalyptic number.

It is an amenable number.

137618861 is a deficient number, since it is larger than the sum of its proper divisors (1).

137618861 is an equidigital number, since it uses as much as digits as its factorization.

137618861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 41.

The square root of 137618861 is about 11731.1065547970. The cubic root of 137618861 is about 516.2887395568.

It can be divided in two parts, 13761 and 8861, that added together give a palindrome (22622).

The spelling of 137618861 in words is "one hundred thirty-seven million, six hundred eighteen thousand, eight hundred sixty-one".