61251612 has 48 divisors (see below), whose sum is σ = 152151552. Its totient is φ = 19111680.

The previous prime is 61251607. The next prime is 61251643. The reversal of 61251612 is 21615216.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 42333 + ... + 43755.

It is an arithmetic number, because the mean of its divisors is an integer number (3169824).

Almost surely, 2^61251612 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 61251612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76075776).

61251612 is an abundant number, since it is smaller than the sum of its proper divisors (90899940).

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

61251612 is a wasteful number, since it uses less digits than its factorization.

61251612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658 (or 1656 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 61251612 is about 7826.3409074739. The cubic root of 61251612 is about 394.1902162422.

Adding to 61251612 its reverse (21615216), we get a palindrome (82866828).

The spelling of 61251612 in words is "sixty-one million, two hundred fifty-one thousand, six hundred twelve".