61001009 has 4 divisors (see below), whose sum is σ = 61233216. Its totient is φ = 60768804.

The previous prime is 61000997. The next prime is 61001033. The reversal of 61001009 is 90010016.

61001009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61001009 - 2¹⁶ = 60935473 is a prime.

It is a super-2 number, since 2×61001009² = 7442246198036162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61001089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115709 + ... + 116234.

It is an arithmetic number, because the mean of its divisors is an integer number (15308304).

Almost surely, 2^61001009 is an apocalyptic number.

It is an amenable number.

61001009 is a deficient number, since it is larger than the sum of its proper divisors (232207).

61001009 is a wasteful number, since it uses less digits than its factorization.

61001009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232206.

The product of its (nonzero) digits is 54, while the sum is 17.

The square root of 61001009 is about 7810.3142702455. The cubic root of 61001009 is about 393.6518887494.

The spelling of 61001009 in words is "sixty-one million, one thousand, nine".