137644919 has 4 divisors (see below), whose sum is σ = 137943960. Its totient is φ = 137345880.

The previous prime is 137644909. The next prime is 137644951. The reversal of 137644919 is 919446731.

137644919 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-137644919 is a prime.

It is a super-2 number, since 2×137644919² = 37892247453033122, which contains 22 as substring.

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 137644919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137644909) 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, 148829 + ... + 149750.

It is an arithmetic number, because the mean of its divisors is an integer number (34485990).

Almost surely, 2^137644919 is an apocalyptic number.

137644919 is a deficient number, since it is larger than the sum of its proper divisors (299041).

137644919 is an equidigital number, since it uses as much as digits as its factorization.

137644919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299040.

The product of its digits is 163296, while the sum is 44.

The square root of 137644919 is about 11732.2171391430. The cubic root of 137644919 is about 516.3213237604.

The spelling of 137644919 in words is "one hundred thirty-seven million, six hundred forty-four thousand, nine hundred nineteen".