61552231 has 4 divisors (see below), whose sum is σ = 66287032. Its totient is φ = 56817432.

The previous prime is 61552199. The next prime is 61552241. The reversal of 61552231 is 13225516.

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 61552231 - 2⁵ = 61552199 is a prime.

It is a super-2 number, since 2×61552231² = 7577354282154722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61552196 and 61552205.

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, 2367381 + ... + 2367406.

It is an arithmetic number, because the mean of its divisors is an integer number (16571758).

Almost surely, 2^61552231 is an apocalyptic number.

61552231 is a deficient number, since it is larger than the sum of its proper divisors (4734801).

61552231 is a wasteful number, since it uses less digits than its factorization.

61552231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4734800.

The product of its digits is 1800, while the sum is 25.

The square root of 61552231 is about 7845.5229908528. The cubic root of 61552231 is about 394.8340508908.

Adding to 61552231 its reverse (13225516), we get a palindrome (74777747).

The spelling of 61552231 in words is "sixty-one million, five hundred fifty-two thousand, two hundred thirty-one".