61552261 has 4 divisors (see below), whose sum is σ = 61577932. Its totient is φ = 61526592.

The previous prime is 61552247. The next prime is 61552279. The reversal of 61552261 is 16225516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21622500 + 39929761 = 4650^2 + 6319^2 .

It is a cyclic number.

It is not a de Polignac number, because 61552261 - 2¹⁹ = 61027973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61552241) 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, 8820 + ... + 14173.

It is an arithmetic number, because the mean of its divisors is an integer number (15394483).

Almost surely, 2^61552261 is an apocalyptic number.

It is an amenable number.

61552261 is a deficient number, since it is larger than the sum of its proper divisors (25671).

61552261 is a wasteful number, since it uses less digits than its factorization.

61552261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25670.

The product of its digits is 3600, while the sum is 28.

The square root of 61552261 is about 7845.5249027710. The cubic root of 61552261 is about 394.8341150370.

Adding to 61552261 its reverse (16225516), we get a palindrome (77777777).

The spelling of 61552261 in words is "sixty-one million, five hundred fifty-two thousand, two hundred sixty-one".