61491433 has 2 divisors, whose sum is σ = 61491434. Its totient is φ = 61491432.

The previous prime is 61491427. The next prime is 61491457. The reversal of 61491433 is 33419416.

61491433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 48553024 + 12938409 = 6968^2 + 3597^2 .

It is a cyclic number.

It is not a de Polignac number, because 61491433 - 2⁵ = 61491401 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61491395 and 61491404.

It is not a weakly prime, because it can be changed into another prime (61491413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30745716 + 30745717.

It is an arithmetic number, because the mean of its divisors is an integer number (30745717).

Almost surely, 2^61491433 is an apocalyptic number.

It is an amenable number.

61491433 is a deficient number, since it is larger than the sum of its proper divisors (1).

61491433 is an equidigital number, since it uses as much as digits as its factorization.

61491433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 31.

The square root of 61491433 is about 7841.6473396857. The cubic root of 61491433 is about 394.7040094164.

The spelling of 61491433 in words is "sixty-one million, four hundred ninety-one thousand, four hundred thirty-three".