19642541 has 6 divisors (see below), whose sum is σ = 20344590. Its totient is φ = 18942168.

The previous prime is 19642501. The next prime is 19642547. The reversal of 19642541 is 14524691.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 2709316 = 4115^2 + 1646^2 .

It is not a de Polignac number, because 19642541 - 2⁶ = 19642477 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19642498 and 19642507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19642547) 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, 23456 + ... + 24278.

It is an arithmetic number, because the mean of its divisors is an integer number (3390765).

Almost surely, 2^19642541 is an apocalyptic number.

It is an amenable number.

19642541 is a deficient number, since it is larger than the sum of its proper divisors (702049).

19642541 is an frugal number, since it uses more digits than its factorization.

19642541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1675 (or 852 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 19642541 is about 4431.9906362717. The cubic root of 19642541 is about 269.8148753852.

The spelling of 19642541 in words is "nineteen million, six hundred forty-two thousand, five hundred forty-one".