61128029 has 4 divisors (see below), whose sum is σ = 61148220. Its totient is φ = 61107840.

The previous prime is 61128019. The next prime is 61128037. The reversal of 61128029 is 92082116.

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 20232004 + 40896025 = 4498^2 + 6395^2 .

It is a cyclic number.

It is not a de Polignac number, because 61128029 - 2⁴ = 61128013 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 61127992 and 61128010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61128019) 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, 4532 + ... + 11949.

It is an arithmetic number, because the mean of its divisors is an integer number (15287055).

Almost surely, 2^61128029 is an apocalyptic number.

It is an amenable number.

61128029 is a deficient number, since it is larger than the sum of its proper divisors (20191).

61128029 is a wasteful number, since it uses less digits than its factorization.

61128029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20190.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 61128029 is about 7818.4415966355. The cubic root of 61128029 is about 393.9249279353.

It can be divided in two parts, 6112 and 8029, that added together give a palindrome (14141).

The spelling of 61128029 in words is "sixty-one million, one hundred twenty-eight thousand, twenty-nine".