32491561 has 2 divisors, whose sum is σ = 32491562. Its totient is φ = 32491560.

The previous prime is 32491541. The next prime is 32491567. The reversal of 32491561 is 16519423.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30735936 + 1755625 = 5544^2 + 1325^2 .

It is an emirp because it is prime and its reverse (16519423) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32491561 is a prime.

It is not a weakly prime, because it can be changed into another prime (32491567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16245780 + 16245781.

It is an arithmetic number, because the mean of its divisors is an integer number (16245781).

Almost surely, 2^32491561 is an apocalyptic number.

It is an amenable number.

32491561 is a deficient number, since it is larger than the sum of its proper divisors (1).

32491561 is an equidigital number, since it uses as much as digits as its factorization.

32491561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 31.

The square root of 32491561 is about 5700.1369281799. The cubic root of 32491561 is about 319.0975910371.

The spelling of 32491561 in words is "thirty-two million, four hundred ninety-one thousand, five hundred sixty-one".