61505501 has 2 divisors, whose sum is σ = 61505502. Its totient is φ = 61505500.

The previous prime is 61505461. The next prime is 61505503. The reversal of 61505501 is 10550516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50779876 + 10725625 = 7126^2 + 3275^2 .

It is a cyclic number.

It is not a de Polignac number, because 61505501 - 2¹⁰ = 61504477 is a prime.

It is a super-2 number, since 2×61505501² = 7565853306522002, which contains 22 as substring.

Together with 61505503, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61505503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30752750 + 30752751.

It is an arithmetic number, because the mean of its divisors is an integer number (30752751).

Almost surely, 2^61505501 is an apocalyptic number.

It is an amenable number.

61505501 is a deficient number, since it is larger than the sum of its proper divisors (1).

61505501 is an equidigital number, since it uses as much as digits as its factorization.

61505501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 61505501 is about 7842.5442937863. The cubic root of 61505501 is about 394.7341072275.

The spelling of 61505501 in words is "sixty-one million, five hundred five thousand, five hundred one".