61012109 has 4 divisors (see below), whose sum is σ = 61122204. Its totient is φ = 60902016.

The previous prime is 61012093. The next prime is 61012129. The reversal of 61012109 is 90121016.

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 33028009 + 27984100 = 5747^2 + 5290^2 .

It is a cyclic number.

It is not a de Polignac number, because 61012109 - 2⁴ = 61012093 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61012129) 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, 54212 + ... + 55325.

It is an arithmetic number, because the mean of its divisors is an integer number (15280551).

Almost surely, 2^61012109 is an apocalyptic number.

It is an amenable number.

61012109 is a deficient number, since it is larger than the sum of its proper divisors (110095).

61012109 is a wasteful number, since it uses less digits than its factorization.

61012109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110094.

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 61012109 is about 7811.0248367292. The cubic root of 61012109 is about 393.6757641521.

The spelling of 61012109 in words is "sixty-one million, twelve thousand, one hundred nine".