2137649623 has 4 divisors (see below), whose sum is σ = 2139578280. Its totient is φ = 2135720968.

The previous prime is 2137649617. The next prime is 2137649627. The reversal of 2137649623 is 3269467312.

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-2137649623 is a prime.

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 2137649623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2137649627) 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, 962665 + ... + 964882.

It is an arithmetic number, because the mean of its divisors is an integer number (534894570).

Almost surely, 2^2137649623 is an apocalyptic number.

2137649623 is a deficient number, since it is larger than the sum of its proper divisors (1928657).

2137649623 is a wasteful number, since it uses less digits than its factorization.

2137649623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1928656.

The product of its digits is 326592, while the sum is 43.

The square root of 2137649623 is about 46234.7231309976. The cubic root of 2137649623 is about 1288.1867887400.

The spelling of 2137649623 in words is "two billion, one hundred thirty-seven million, six hundred forty-nine thousand, six hundred twenty-three".