61545439 has 2 divisors, whose sum is σ = 61545440. Its totient is φ = 61545438.

The previous prime is 61545409. The next prime is 61545481. The reversal of 61545439 is 93454516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61545439 - 2⁷ = 61545311 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 61545398 and 61545407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61545409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30772719 + 30772720.

It is an arithmetic number, because the mean of its divisors is an integer number (30772720).

Almost surely, 2^61545439 is an apocalyptic number.

61545439 is a deficient number, since it is larger than the sum of its proper divisors (1).

61545439 is an equidigital number, since it uses as much as digits as its factorization.

61545439 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64800, while the sum is 37.

The square root of 61545439 is about 7845.0901205786. The cubic root of 61545439 is about 394.8195276614.

The spelling of 61545439 in words is "sixty-one million, five hundred forty-five thousand, four hundred thirty-nine".