61609012 has 6 divisors (see below), whose sum is σ = 107815778. Its totient is φ = 30804504.

The previous prime is 61608983. The next prime is 61609013. The reversal of 61609012 is 21090616.

It can be written as a sum of positive squares in only one way, i.e., 61402896 + 206116 = 7836^2 + 454^2 .

It is a super-2 number, since 2×61609012² = 7591340719232288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61609013) 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 as a sum of consecutive naturals, namely, 7701123 + ... + 7701130.

Almost surely, 2^61609012 is an apocalyptic number.

It is an amenable number.

61609012 is a deficient number, since it is larger than the sum of its proper divisors (46206766).

61609012 is a wasteful number, since it uses less digits than its factorization.

61609012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15402257 (or 15402255 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 61609012 is about 7849.1408447040. The cubic root of 61609012 is about 394.9554230527.

Adding to 61609012 its reverse (21090616), we get a palindrome (82699628).

The spelling of 61609012 in words is "sixty-one million, six hundred nine thousand, twelve".