61557223 has 16 divisors (see below), whose sum is σ = 79059456. Its totient is φ = 46585440.

The previous prime is 61557211. The next prime is 61557247. The reversal of 61557223 is 32275516.

It is a cyclic number.

It is not a de Polignac number, because 61557223 - 2⁵ = 61557191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61557203) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12613 + ... + 16798.

It is an arithmetic number, because the mean of its divisors is an integer number (4941216).

Almost surely, 2^61557223 is an apocalyptic number.

61557223 is a deficient number, since it is larger than the sum of its proper divisors (17502233).

61557223 is a wasteful number, since it uses less digits than its factorization.

61557223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29454.

The product of its digits is 12600, while the sum is 31.

The square root of 61557223 is about 7845.8411276293. The cubic root of 61557223 is about 394.8447245267.

The spelling of 61557223 in words is "sixty-one million, five hundred fifty-seven thousand, two hundred twenty-three".