61309252 has 12 divisors (see below), whose sum is σ = 108497340. Its totient is φ = 30310016.

The previous prime is 61309249. The next prime is 61309267. The reversal of 61309252 is 25290316.

It can be written as a sum of positive squares in 2 ways, for example, as 5597956 + 55711296 = 2366^2 + 7464^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 61309252.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 85753 + ... + 86464.

It is an arithmetic number, because the mean of its divisors is an integer number (9041445).

Almost surely, 2^61309252 is an apocalyptic number.

It is an amenable number.

61309252 is a deficient number, since it is larger than the sum of its proper divisors (47188088).

61309252 is a wasteful number, since it uses less digits than its factorization.

61309252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172310 (or 172308 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 61309252 is about 7830.0224776178. The cubic root of 61309252 is about 394.3138265980.

Adding to 61309252 its reverse (25290316), we get a palindrome (86599568).

The spelling of 61309252 in words is "sixty-one million, three hundred nine thousand, two hundred fifty-two".