19901619419 has 4 divisors (see below), whose sum is σ = 21710857560. Its totient is φ = 18092381280.

The previous prime is 19901619371. The next prime is 19901619461. The reversal of 19901619419 is 91491610991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19901619419 - 2¹⁶ = 19901553883 is a prime.

It is a super-2 number, since 2×19901619419² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19901619019) 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, 904619054 + ... + 904619075.

It is an arithmetic number, because the mean of its divisors is an integer number (5427714390).

Almost surely, 2^19901619419 is an apocalyptic number.

19901619419 is a deficient number, since it is larger than the sum of its proper divisors (1809238141).

19901619419 is a wasteful number, since it uses less digits than its factorization.

19901619419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1809238140.

The product of its (nonzero) digits is 157464, while the sum is 50.

The spelling of 19901619419 in words is "nineteen billion, nine hundred one million, six hundred nineteen thousand, four hundred nineteen".