1919154949 has 4 divisors (see below), whose sum is σ = 1919290464. Its totient is φ = 1919019436.

The previous prime is 1919154947. The next prime is 1919154959. The reversal of 1919154949 is 9494519191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1919154949 - 2¹ = 1919154947 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1919154896 and 1919154905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919154947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43657 + ... + 75790.

It is an arithmetic number, because the mean of its divisors is an integer number (479822616).

Almost surely, 2^1919154949 is an apocalyptic number.

It is an amenable number.

1919154949 is a deficient number, since it is larger than the sum of its proper divisors (135515).

1919154949 is a wasteful number, since it uses less digits than its factorization.

1919154949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135514.

The product of its digits is 524880, while the sum is 52.

The square root of 1919154949 is about 43808.1607580140. The cubic root of 1919154949 is about 1242.7106304886.

The spelling of 1919154949 in words is "one billion, nine hundred nineteen million, one hundred fifty-four thousand, nine hundred forty-nine".