137881 has 4 divisors (see below), whose sum is σ = 138852. Its totient is φ = 136912.

The previous prime is 137873. The next prime is 137909. The reversal of 137881 is 188731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 188731 = 79 ⋅2389.

It can be written as a sum of positive squares in 2 ways, for example, as 99856 + 38025 = 316^2 + 195^2 .

It is a cyclic number.

It is not a de Polignac number, because 137881 - 2³ = 137873 is a prime.

It is a super-2 number, since 2×137881² = 38022340322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226 + ... + 571.

It is an arithmetic number, because the mean of its divisors is an integer number (34713).

2¹³⁷⁸⁸¹ is an apocalyptic number.

It is an amenable number.

137881 is a deficient number, since it is larger than the sum of its proper divisors (971).

137881 is an equidigital number, since it uses as much as digits as its factorization.

137881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

The product of its digits is 1344, while the sum is 28.

The square root of 137881 is about 371.3233092603. The cubic root of 137881 is about 51.6616343810.

The spelling of 137881 in words is "one hundred thirty-seven thousand, eight hundred eighty-one".