61552131 has 4 divisors (see below), whose sum is σ = 82069512. Its totient is φ = 41034752.

The previous prime is 61552109. The next prime is 61552151. The reversal of 61552131 is 13125516.

61552131 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 61552131 - 2⁷ = 61552003 is a prime.

It is a super-2 number, since 2×61552131² = 7577329661282322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61552151) 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 3 ways as a sum of consecutive naturals, for example, 10258686 + ... + 10258691.

It is an arithmetic number, because the mean of its divisors is an integer number (20517378).

Almost surely, 2^61552131 is an apocalyptic number.

61552131 is a deficient number, since it is larger than the sum of its proper divisors (20517381).

61552131 is a wasteful number, since it uses less digits than its factorization.

61552131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20517380.

The product of its digits is 900, while the sum is 24.

The square root of 61552131 is about 7845.5166177888. The cubic root of 61552131 is about 394.8338370701.

Adding to 61552131 its reverse (13125516), we get a palindrome (74677647).

The spelling of 61552131 in words is "sixty-one million, five hundred fifty-two thousand, one hundred thirty-one".