61145521 has 4 divisors (see below), whose sum is σ = 61401600. Its totient is φ = 60889444.

The previous prime is 61145509. The next prime is 61145531. The reversal of 61145521 is 12554116.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61145521 - 2⁷ = 61145393 is a prime.

It is a super-2 number, since 2×61145521² = 7477549476722882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61145531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127681 + ... + 128158.

It is an arithmetic number, because the mean of its divisors is an integer number (15350400).

Almost surely, 2^61145521 is an apocalyptic number.

It is an amenable number.

61145521 is a deficient number, since it is larger than the sum of its proper divisors (256079).

61145521 is a wasteful number, since it uses less digits than its factorization.

61145521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256078.

The product of its digits is 1200, while the sum is 25.

The square root of 61145521 is about 7819.5601538705. The cubic root of 61145521 is about 393.9624986853.

Adding to 61145521 its reverse (12554116), we get a palindrome (73699637).

The spelling of 61145521 in words is "sixty-one million, one hundred forty-five thousand, five hundred twenty-one".