19948341901 has 4 divisors (see below), whose sum is σ = 19948630204. Its totient is φ = 19948053600.

The previous prime is 19948341893. The next prime is 19948341913. The reversal of 19948341901 is 10914384991.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 13806485001 + 6141856900 = 117501^2 + 78370^2 .

It is a 3-Lehmer number, since φ(19948341901) divides (19948341901-1)³.

It is a cyclic number.

It is not a de Polignac number, because 19948341901 - 2³ = 19948341893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19948341601) 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, 28831 + ... + 201811.

It is an arithmetic number, because the mean of its divisors is an integer number (4987157551).

It is a Poulet number, since it divides 2^19948341900-1.

Almost surely, 2^19948341901 is an apocalyptic number.

19948341901 is the 115321-st pentagonal number.

It is an amenable number.

19948341901 is a deficient number, since it is larger than the sum of its proper divisors (288303).

19948341901 is a wasteful number, since it uses less digits than its factorization.

19948341901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288302.

The product of its (nonzero) digits is 279936, while the sum is 49.

The spelling of 19948341901 in words is "nineteen billion, nine hundred forty-eight million, three hundred forty-one thousand, nine hundred one".