61011520 has 56 divisors (see below), whose sum is σ = 149239224. Its totient is φ = 23740416.

The previous prime is 61011497. The next prime is 61011523. The reversal of 61011520 is 2511016.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20358144 + 40653376 = 4512^2 + 6376^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 61011494 and 61011503.

It is not an unprimeable number, because it can be changed into a prime (61011523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9264 + ... + 14416.

Almost surely, 2^61011520 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 61011520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74619612).

61011520 is an abundant number, since it is smaller than the sum of its proper divisors (88227704).

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

61011520 is a wasteful number, since it uses less digits than its factorization.

61011520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5207 (or 5197 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 61011520 is about 7810.9871335190. The cubic root of 61011520 is about 393.6744973229.

Adding to 61011520 its reverse (2511016), we get a palindrome (63522536).

The spelling of 61011520 in words is "sixty-one million, eleven thousand, five hundred twenty".