31899541 has 2 divisors, whose sum is σ = 31899542. Its totient is φ = 31899540.

The previous prime is 31899521. The next prime is 31899547. The reversal of 31899541 is 14599813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28462225 + 3437316 = 5335^2 + 1854^2 .

It is a cyclic number.

It is not a de Polignac number, because 31899541 - 2¹¹ = 31897493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31899494 and 31899503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31899547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15949770 + 15949771.

It is an arithmetic number, because the mean of its divisors is an integer number (15949771).

Almost surely, 2^31899541 is an apocalyptic number.

It is an amenable number.

31899541 is a deficient number, since it is larger than the sum of its proper divisors (1).

31899541 is an equidigital number, since it uses as much as digits as its factorization.

31899541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 40.

The square root of 31899541 is about 5647.9678646395. The cubic root of 31899541 is about 317.1476356235.

The spelling of 31899541 in words is "thirty-one million, eight hundred ninety-nine thousand, five hundred forty-one".