61135520 has 48 divisors (see below), whose sum is σ = 145823328. Its totient is φ = 24218880.

The previous prime is 61135517. The next prime is 61135531. The reversal of 61135520 is 2553116.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15335 + ... + 18905.

It is an arithmetic number, because the mean of its divisors is an integer number (3037986).

Almost surely, 2^61135520 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 61135520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72911664).

61135520 is an abundant number, since it is smaller than the sum of its proper divisors (84687808).

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

61135520 is a wasteful number, since it uses less digits than its factorization.

61135520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3693 (or 3685 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 61135520 is about 7818.9206416231. The cubic root of 61135520 is about 393.9410185959.

Adding to 61135520 its reverse (2553116), we get a palindrome (63688636).

The spelling of 61135520 in words is "sixty-one million, one hundred thirty-five thousand, five hundred twenty".