61317612 has 18 divisors (see below), whose sum is σ = 154997388. Its totient is φ = 20439192.

The previous prime is 61317611. The next prime is 61317631. The reversal of 61317612 is 21671316.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (61317611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 851598 + ... + 851669.

It is an arithmetic number, because the mean of its divisors is an integer number (8610966).

Almost surely, 2^61317612 is an apocalyptic number.

It is an amenable number.

61317612 is an abundant number, since it is smaller than the sum of its proper divisors (93679776).

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

61317612 is a wasteful number, since it uses less digits than its factorization.

61317612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1703277 (or 1703272 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 61317612 is about 7830.5563020771. The cubic root of 61317612 is about 394.3317483834.

Adding to 61317612 its reverse (21671316), we get a palindrome (82988928).

It can be divided in two parts, 613 and 17612, that added together give a square (18225 = 135²).

The spelling of 61317612 in words is "sixty-one million, three hundred seventeen thousand, six hundred twelve".