1949743091 has 4 divisors (see below), whose sum is σ = 1949877384. Its totient is φ = 1949608800.

The previous prime is 1949743031. The next prime is 1949743099. The reversal of 1949743091 is 1903479491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1903479491 = 457 ⋅4165163.

It is a cyclic number.

It is not a de Polignac number, because 1949743091 - 2⁶ = 1949743027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1949743099) 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, 42305 + ... + 75426.

It is an arithmetic number, because the mean of its divisors is an integer number (487469346).

Almost surely, 2^1949743091 is an apocalyptic number.

1949743091 is a deficient number, since it is larger than the sum of its proper divisors (134293).

1949743091 is a wasteful number, since it uses less digits than its factorization.

1949743091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134292.

The product of its (nonzero) digits is 244944, while the sum is 47.

The square root of 1949743091 is about 44155.8953142160. The cubic root of 1949743091 is about 1249.2781092593.

The spelling of 1949743091 in words is "one billion, nine hundred forty-nine million, seven hundred forty-three thousand, ninety-one".