137549881 has 4 divisors (see below), whose sum is σ = 157199872. Its totient is φ = 117899892.

The previous prime is 137549843. The next prime is 137549897. The reversal of 137549881 is 188945731.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 137549881 - 2²⁵ = 103995449 is a prime.

It is a super-2 number, since 2×137549881² = 37839939526228322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137549801) 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, 9824985 + ... + 9824998.

It is an arithmetic number, because the mean of its divisors is an integer number (39299968).

Almost surely, 2^137549881 is an apocalyptic number.

It is an amenable number.

137549881 is a deficient number, since it is larger than the sum of its proper divisors (19649991).

137549881 is an equidigital number, since it uses as much as digits as its factorization.

137549881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19649990.

The product of its digits is 241920, while the sum is 46.

The square root of 137549881 is about 11728.1661396827. The cubic root of 137549881 is about 516.2024637151.

The spelling of 137549881 in words is "one hundred thirty-seven million, five hundred forty-nine thousand, eight hundred eighty-one".