61555129 has 4 divisors (see below), whose sum is σ = 61574884. Its totient is φ = 61535376.

The previous prime is 61555127. The next prime is 61555163. The reversal of 61555129 is 92155516.

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 45873529 + 15681600 = 6773^2 + 3960^2 .

It is a cyclic number.

It is not a de Polignac number, because 61555129 - 2¹ = 61555127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61555094 and 61555103.

It is not an unprimeable number, because it can be changed into a prime (61555127) 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, 4062 + ... + 11815.

It is an arithmetic number, because the mean of its divisors is an integer number (15393721).

Almost surely, 2^61555129 is an apocalyptic number.

It is an amenable number.

61555129 is a deficient number, since it is larger than the sum of its proper divisors (19755).

61555129 is a wasteful number, since it uses less digits than its factorization.

61555129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19754.

The product of its digits is 13500, while the sum is 34.

The square root of 61555129 is about 7845.7076799993. The cubic root of 61555129 is about 394.8402473146.

The spelling of 61555129 in words is "sixty-one million, five hundred fifty-five thousand, one hundred twenty-nine".