61161521 has 4 divisors (see below), whose sum is σ = 61733232. Its totient is φ = 60589812.

The previous prime is 61161511. The next prime is 61161539. The reversal of 61161521 is 12516116.

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 61161521 - 2¹⁰ = 61160497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61161511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285695 + ... + 285908.

It is an arithmetic number, because the mean of its divisors is an integer number (15433308).

Almost surely, 2^61161521 is an apocalyptic number.

It is an amenable number.

61161521 is a deficient number, since it is larger than the sum of its proper divisors (571711).

61161521 is a wasteful number, since it uses less digits than its factorization.

61161521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571710.

The product of its digits is 360, while the sum is 23.

The square root of 61161521 is about 7820.5831623991. The cubic root of 61161521 is about 393.9968585215.

Adding to 61161521 its reverse (12516116), we get a palindrome (73677637).

The spelling of 61161521 in words is "sixty-one million, one hundred sixty-one thousand, five hundred twenty-one".