61581002 has 16 divisors (see below), whose sum is σ = 105719040. Its totient is φ = 26353968.

The previous prime is 61581001. The next prime is 61581011. The reversal of 61581002 is 20018516.

It is not an unprimeable number, because it can be changed into a prime (61581001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8399 + ... + 13917.

It is an arithmetic number, because the mean of its divisors is an integer number (6607440).

Almost surely, 2^61581002 is an apocalyptic number.

61581002 is a deficient number, since it is larger than the sum of its proper divisors (44138038).

61581002 is a wasteful number, since it uses less digits than its factorization.

61581002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6325.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 61581002 is about 7847.3563701415. The cubic root of 61581002 is about 394.8955596334.

Adding to 61581002 its reverse (20018516), we get a palindrome (81599518).

The spelling of 61581002 in words is "sixty-one million, five hundred eighty-one thousand, two".