61443539 has 2 divisors, whose sum is σ = 61443540. Its totient is φ = 61443538.

The previous prime is 61443509. The next prime is 61443563. The reversal of 61443539 is 93534416.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61443539 - 2²⁰ = 60394963 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61443499 and 61443508.

It is not a weakly prime, because it can be changed into another prime (61443509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30721769 + 30721770.

It is an arithmetic number, because the mean of its divisors is an integer number (30721770).

Almost surely, 2^61443539 is an apocalyptic number.

61443539 is a deficient number, since it is larger than the sum of its proper divisors (1).

61443539 is an equidigital number, since it uses as much as digits as its factorization.

61443539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 35.

The square root of 61443539 is about 7838.5929222023. The cubic root of 61443539 is about 394.6015080708.

The spelling of 61443539 in words is "sixty-one million, four hundred forty-three thousand, five hundred thirty-nine".