137143681 has 4 divisors (see below), whose sum is σ = 137677572. Its totient is φ = 136609792.

The previous prime is 137143673. The next prime is 137143723. The reversal of 137143681 is 186341731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186341731 = 37 ⋅5036263.

It can be written as a sum of positive squares in 2 ways, for example, as 77158656 + 59985025 = 8784^2 + 7745^2 .

It is a cyclic number.

It is not a de Polignac number, because 137143681 - 2³ = 137143673 is a prime.

It is a super-2 number, since 2×137143681² = 37616778476459522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137143621) 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, 266560 + ... + 267073.

It is an arithmetic number, because the mean of its divisors is an integer number (34419393).

Almost surely, 2^137143681 is an apocalyptic number.

It is an amenable number.

137143681 is a deficient number, since it is larger than the sum of its proper divisors (533891).

137143681 is an equidigital number, since it uses as much as digits as its factorization.

137143681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 533890.

The product of its digits is 12096, while the sum is 34.

The square root of 137143681 is about 11710.8360504278. The cubic root of 137143681 is about 515.6938283927.

The spelling of 137143681 in words is "one hundred thirty-seven million, one hundred forty-three thousand, six hundred eighty-one".