61512261 has 8 divisors (see below), whose sum is σ = 82938240. Its totient is φ = 40547232.

The previous prime is 61512251. The next prime is 61512289. The reversal of 61512261 is 16221516.

61512261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61512261 - 2¹⁰ = 61511237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61512211) 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 in 7 ways as a sum of consecutive naturals, for example, 114925 + ... + 115458.

It is an arithmetic number, because the mean of its divisors is an integer number (10367280).

Almost surely, 2^61512261 is an apocalyptic number.

It is an amenable number.

61512261 is a deficient number, since it is larger than the sum of its proper divisors (21425979).

61512261 is a wasteful number, since it uses less digits than its factorization.

61512261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230475.

The product of its digits is 720, while the sum is 24.

The square root of 61512261 is about 7842.9752645281. The cubic root of 61512261 is about 394.7485682907.

Adding to 61512261 its reverse (16221516), we get a palindrome (77733777).

The spelling of 61512261 in words is "sixty-one million, five hundred twelve thousand, two hundred sixty-one".