61509112 has 48 divisors (see below), whose sum is σ = 135083160. Its totient is φ = 26179776.

The previous prime is 61509103. The next prime is 61509121. The reversal of 61509112 is 21190516.

It is an interprime number because it is at equal distance from previous prime (61509103) and next prime (61509121).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67363 + ... + 68269.

Almost surely, 2^61509112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61509112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67541580).

61509112 is an abundant number, since it is smaller than the sum of its proper divisors (73574048).

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

61509112 is a wasteful number, since it uses less digits than its factorization.

61509112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100 (or 1089 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 61509112 is about 7842.7745090625. The cubic root of 61509112 is about 394.7418320486.

Adding to 61509112 its reverse (21190516), we get a palindrome (82699628).

The spelling of 61509112 in words is "sixty-one million, five hundred nine thousand, one hundred twelve".