61121500 has 48 divisors (see below), whose sum is σ = 145637856. Its totient is φ = 22224000.

The previous prime is 61121399. The next prime is 61121507. The reversal of 61121500 is 512116.

It is a happy number.

It is a hoax number, since the sum of its digits (16) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61121507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57 + ... + 11056.

It is an arithmetic number, because the mean of its divisors is an integer number (3034122).

Almost surely, 2^61121500 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 61121500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72818928).

61121500 is an abundant number, since it is smaller than the sum of its proper divisors (84516356).

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

61121500 is a wasteful number, since it uses less digits than its factorization.

61121500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11143 (or 11131 counting only the distinct ones).

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

The square root of 61121500 is about 7818.0240470339. The cubic root of 61121500 is about 393.9109025775.

Adding to 61121500 its reverse (512116), we get a palindrome (61633616).

The spelling of 61121500 in words is "sixty-one million, one hundred twenty-one thousand, five hundred".