28131541 has 2 divisors, whose sum is σ = 28131542. Its totient is φ = 28131540.

The previous prime is 28131527. The next prime is 28131547. The reversal of 28131541 is 14513182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27783441 + 348100 = 5271^2 + 590^2 .

It is a cyclic number.

It is not a de Polignac number, because 28131541 - 2¹⁹ = 27607253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28131547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14065770 + 14065771.

It is an arithmetic number, because the mean of its divisors is an integer number (14065771).

Almost surely, 2^28131541 is an apocalyptic number.

It is an amenable number.

28131541 is a deficient number, since it is larger than the sum of its proper divisors (1).

28131541 is an equidigital number, since it uses as much as digits as its factorization.

28131541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960, while the sum is 25.

The square root of 28131541 is about 5303.9175144416. The cubic root of 28131541 is about 304.1336734673.

The spelling of 28131541 in words is "twenty-eight million, one hundred thirty-one thousand, five hundred forty-one".