61002109 has 12 divisors (see below), whose sum is σ = 73410300. Its totient is φ = 50483328.

The previous prime is 61002077. The next prime is 61002119. The reversal of 61002109 is 90120016.

It can be written as a sum of positive squares in 2 ways, for example, as 9922500 + 51079609 = 3150^2 + 7147^2 .

It is not a de Polignac number, because 61002109 - 2⁵ = 61002077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61002119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20044 + ... + 22885.

It is an arithmetic number, because the mean of its divisors is an integer number (6117525).

Almost surely, 2^61002109 is an apocalyptic number.

It is an amenable number.

61002109 is a deficient number, since it is larger than the sum of its proper divisors (12408191).

61002109 is a wasteful number, since it uses less digits than its factorization.

61002109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42972 (or 42965 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 61002109 is about 7810.3846896296. The cubic root of 61002109 is about 393.6542549096.

The spelling of 61002109 in words is "sixty-one million, two thousand, one hundred nine".