61439533 has 2 divisors, whose sum is σ = 61439534. Its totient is φ = 61439532.

The previous prime is 61439531. The next prime is 61439549. The reversal of 61439533 is 33593416.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49028004 + 12411529 = 7002^2 + 3523^2 .

It is a cyclic number.

It is not a de Polignac number, because 61439533 - 2¹ = 61439531 is a prime.

Together with 61439531, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61439531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30719766 + 30719767.

It is an arithmetic number, because the mean of its divisors is an integer number (30719767).

Almost surely, 2^61439533 is an apocalyptic number.

It is an amenable number.

61439533 is a deficient number, since it is larger than the sum of its proper divisors (1).

61439533 is an equidigital number, since it uses as much as digits as its factorization.

61439533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 34.

The square root of 61439533 is about 7838.3373874821. The cubic root of 61439533 is about 394.5929321325.

The spelling of 61439533 in words is "sixty-one million, four hundred thirty-nine thousand, five hundred thirty-three".