61042909 has 4 divisors (see below), whose sum is σ = 62194716. Its totient is φ = 59891104.

The previous prime is 61042901. The next prime is 61042913. The reversal of 61042909 is 90924016.

It is a happy number.

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 17614809 + 43428100 = 4197^2 + 6590^2 .

It is a cyclic number.

It is not a de Polignac number, because 61042909 - 2³ = 61042901 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61042901) 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, 575824 + ... + 575929.

It is an arithmetic number, because the mean of its divisors is an integer number (15548679).

Almost surely, 2^61042909 is an apocalyptic number.

It is an amenable number.

61042909 is a deficient number, since it is larger than the sum of its proper divisors (1151807).

61042909 is a wasteful number, since it uses less digits than its factorization.

61042909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151806.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 61042909 is about 7812.9961602448. The cubic root of 61042909 is about 393.7419978553.

The spelling of 61042909 in words is "sixty-one million, forty-two thousand, nine hundred nine".