19901043 has 6 divisors (see below), whose sum is σ = 28745964. Its totient is φ = 13267356.

The previous prime is 19901029. The next prime is 19901051. The reversal of 19901043 is 34010991.

It is a de Polignac number, because none of the positive numbers 2^k-19901043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19900998 and 19901016.

It is not an unprimeable number, because it can be changed into a prime (19901083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1105605 + ... + 1105622.

It is an arithmetic number, because the mean of its divisors is an integer number (4790994).

Almost surely, 2^19901043 is an apocalyptic number.

19901043 is a deficient number, since it is larger than the sum of its proper divisors (8844921).

19901043 is a wasteful number, since it uses less digits than its factorization.

19901043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211233 (or 2211230 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 19901043 is about 4461.0585066775. The cubic root of 19901043 is about 270.9933368913.

The spelling of 19901043 in words is "nineteen million, nine hundred one thousand, forty-three".