61155533 has 2 divisors, whose sum is σ = 61155534. Its totient is φ = 61155532.

The previous prime is 61155517. The next prime is 61155539. The reversal of 61155533 is 33555116.

61155533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45131524 + 16024009 = 6718^2 + 4003^2 .

It is a cyclic number.

It is not a de Polignac number, because 61155533 - 2⁴ = 61155517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61155496 and 61155505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61155539) 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, 30577766 + 30577767.

It is an arithmetic number, because the mean of its divisors is an integer number (30577767).

Almost surely, 2^61155533 is an apocalyptic number.

It is an amenable number.

61155533 is a deficient number, since it is larger than the sum of its proper divisors (1).

61155533 is an equidigital number, since it uses as much as digits as its factorization.

61155533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6750, while the sum is 29.

The square root of 61155533 is about 7820.2003171274. The cubic root of 61155533 is about 393.9840000546.

The spelling of 61155533 in words is "sixty-one million, one hundred fifty-five thousand, five hundred thirty-three".