137444731 has 4 divisors (see below), whose sum is σ = 141878464. Its totient is φ = 133011000.

The previous prime is 137444719. The next prime is 137444819.

137444731 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is not a de Polignac number, because 137444731 - 2²¹ = 135347579 is a prime.

It is a super-2 number, since 2×137444731² = 37782108159324722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (137444231) 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, 2216820 + ... + 2216881.

It is an arithmetic number, because the mean of its divisors is an integer number (35469616).

Almost surely, 2^137444731 is an apocalyptic number.

137444731 is a deficient number, since it is larger than the sum of its proper divisors (4433733).

137444731 is an equidigital number, since it uses as much as digits as its factorization.

137444731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433732.

The product of its digits is 28224, while the sum is 34.

The square root of 137444731 is about 11723.6824846121. The cubic root of 137444731 is about 516.0708932001.

The spelling of 137444731 in words is "one hundred thirty-seven million, four hundred forty-four thousand, seven hundred thirty-one".