1919540181 has 16 divisors (see below), whose sum is σ = 2845176320. Its totient is φ = 1143149760.

The previous prime is 1919540179. The next prime is 1919540191. The reversal of 1919540181 is 1810459191.

It is not a de Polignac number, because 1919540181 - 2¹ = 1919540179 is a prime.

It is a super-2 number, since 2×1919540181² = 7369269012947025522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1919540111) 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 15 ways as a sum of consecutive naturals, for example, 792646 + ... + 795063.

It is an arithmetic number, because the mean of its divisors is an integer number (177823520).

Almost surely, 2^1919540181 is an apocalyptic number.

It is an amenable number.

1919540181 is a deficient number, since it is larger than the sum of its proper divisors (925636139).

1919540181 is a wasteful number, since it uses less digits than its factorization.

1919540181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1587756.

The product of its (nonzero) digits is 12960, while the sum is 39.

The square root of 1919540181 is about 43812.5573437571. The cubic root of 1919540181 is about 1242.7937746998.

The spelling of 1919540181 in words is "one billion, nine hundred nineteen million, five hundred forty thousand, one hundred eighty-one".