61555143 has 16 divisors (see below), whose sum is σ = 88592000. Its totient is φ = 37792224.

The previous prime is 61555127. The next prime is 61555163. The reversal of 61555143 is 34155516.

It is not a de Polignac number, because 61555143 - 2⁴ = 61555127 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61555143.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61555103) 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, 17880 + ... + 21042.

It is an arithmetic number, because the mean of its divisors is an integer number (5537000).

Almost surely, 2^61555143 is an apocalyptic number.

61555143 is a deficient number, since it is larger than the sum of its proper divisors (27036857).

61555143 is a wasteful number, since it uses less digits than its factorization.

61555143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3678.

The product of its digits is 9000, while the sum is 30.

The square root of 61555143 is about 7845.7085722068. The cubic root of 61555143 is about 394.8402772486.

The spelling of 61555143 in words is "sixty-one million, five hundred fifty-five thousand, one hundred forty-three".