1949645687 has 4 divisors (see below), whose sum is σ = 2126886216. Its totient is φ = 1772405160.

The previous prime is 1949645683. The next prime is 1949645713. The reversal of 1949645687 is 7865469491.

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 1949645687 - 2² = 1949645683 is a prime.

It is a super-2 number, since 2×1949645687² = 7602236609675403938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949645683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88620248 + ... + 88620269.

It is an arithmetic number, because the mean of its divisors is an integer number (531721554).

Almost surely, 2^1949645687 is an apocalyptic number.

1949645687 is a deficient number, since it is larger than the sum of its proper divisors (177240529).

1949645687 is a wasteful number, since it uses less digits than its factorization.

1949645687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177240528.

The product of its digits is 13063680, while the sum is 59.

The square root of 1949645687 is about 44154.7923446595. The cubic root of 1949645687 is about 1249.2573053711.

The spelling of 1949645687 in words is "one billion, nine hundred forty-nine million, six hundred forty-five thousand, six hundred eighty-seven".