61000002 has 144 divisors (see below), whose sum is σ = 167311872. Its totient is φ = 15966720.

The previous prime is 61000001. The next prime is 61000003. The reversal of 61000002 is 20000016.

It is an interprime number because it is at equal distance from previous prime (61000001) and next prime (61000003).

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (61000001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 628818 + ... + 628914.

It is an arithmetic number, because the mean of its divisors is an integer number (1161888).

Almost surely, 2^61000002 is an apocalyptic number.

61000002 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 61000002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83655936).

61000002 is an abundant number, since it is smaller than the sum of its proper divisors (106311870).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61000002 is a wasteful number, since it uses less digits than its factorization.

61000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173 (or 163 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

The square root of 61000002 is about 7810.2498039435. The cubic root of 61000002 is about 393.6497226124.

Adding to 61000002 its reverse (20000016), we get a palindrome (81000018).

The spelling of 61000002 in words is "sixty-one million, two", and thus it is an aban number and an uban number.