61129205 has 8 divisors (see below), whose sum is σ = 74179800. Its totient is φ = 48353536.

The previous prime is 61129171. The next prime is 61129253. The reversal of 61129205 is 50292116.

It can be written as a sum of positive squares in 4 ways, for example, as 23716 + 61105489 = 154^2 + 7817^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61129205 - 2⁶ = 61129141 is a prime.

It is a zygodrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68240 + ... + 69129.

It is an arithmetic number, because the mean of its divisors is an integer number (9272475).

Almost surely, 2^61129205 is an apocalyptic number.

It is an amenable number.

61129205 is a deficient number, since it is larger than the sum of its proper divisors (13050595).

61129205 is a wasteful number, since it uses less digits than its factorization.

61129205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137463.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 61129205 is about 7818.5168030772. The cubic root of 61129205 is about 393.9274540691.

It can be divided in two parts, 6 and 1129205, that added together give a palindrome (1129211).

The spelling of 61129205 in words is "sixty-one million, one hundred twenty-nine thousand, two hundred five".