1949988691 has 24 divisors (see below), whose sum is σ = 2404957184. Its totient is φ = 1547084880.

The previous prime is 1949988653. The next prime is 1949988697. The reversal of 1949988691 is 1968899491.

It is not a de Polignac number, because 1949988691 - 2¹³ = 1949980499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1949988697) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106300 + ... + 123286.

Almost surely, 2^1949988691 is an apocalyptic number.

1949988691 is a deficient number, since it is larger than the sum of its proper divisors (454968493).

1949988691 is a wasteful number, since it uses less digits than its factorization.

1949988691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17071 (or 17048 counting only the distinct ones).

The product of its digits is 10077696, while the sum is 64.

The square root of 1949988691 is about 44158.6762822438. The cubic root of 1949988691 is about 1249.3305622932.

The spelling of 1949988691 in words is "one billion, nine hundred forty-nine million, nine hundred eighty-eight thousand, six hundred ninety-one".