1949355091 has 4 divisors (see below), whose sum is σ = 1956392752. Its totient is φ = 1942317432.

The previous prime is 1949355049. The next prime is 1949355119. The reversal of 1949355091 is 1905539491.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1905539491 = 1103 ⋅1727597.

It is a cyclic number.

It is not a de Polignac number, because 1949355091 - 2¹⁹ = 1948830803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1949355011) 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, 3518415 + ... + 3518968.

It is an arithmetic number, because the mean of its divisors is an integer number (489098188).

Almost surely, 2^1949355091 is an apocalyptic number.

1949355091 is a deficient number, since it is larger than the sum of its proper divisors (7037661).

1949355091 is an equidigital number, since it uses as much as digits as its factorization.

1949355091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7037660.

The product of its (nonzero) digits is 218700, while the sum is 46.

The square root of 1949355091 is about 44151.5015712943. The cubic root of 1949355091 is about 1249.1952347402.

The spelling of 1949355091 in words is "one billion, nine hundred forty-nine million, three hundred fifty-five thousand, ninety-one".