137861 has 4 divisors (see below), whose sum is σ = 139500. Its totient is φ = 136224.

The previous prime is 137849. The next prime is 137867. The reversal of 137861 is 168731.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36100 + 101761 = 190^2 + 319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137861 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 137861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686 + ... + 863.

It is an arithmetic number, because the mean of its divisors is an integer number (34875).

2¹³⁷⁸⁶¹ is an apocalyptic number.

It is an amenable number.

137861 is a deficient number, since it is larger than the sum of its proper divisors (1639).

137861 is an equidigital number, since it uses as much as digits as its factorization.

137861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638.

The product of its digits is 1008, while the sum is 26.

The square root of 137861 is about 371.2963775746. The cubic root of 137861 is about 51.6591363751.

The spelling of 137861 in words is "one hundred thirty-seven thousand, eight hundred sixty-one".