61500150 has 72 divisors (see below), whose sum is σ = 173950920. Its totient is φ = 15534720.

The previous prime is 61500149. The next prime is 61500151. The reversal of 61500150 is 5100516.

61500150 is a `hidden beast` number, since 615 + 0 + 0 + 1 + 50 = 666.

It is an interprime number because it is at equal distance from previous prime (61500149) and next prime (61500151).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61500151) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4954 + ... + 12146.

It is an arithmetic number, because the mean of its divisors is an integer number (2415985).

Almost surely, 2^61500150 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61500150, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86975460).

61500150 is an abundant number, since it is smaller than the sum of its proper divisors (112450770).

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

61500150 is a wasteful number, since it uses less digits than its factorization.

61500150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7230 (or 7222 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 61500150 is about 7842.2031343239. The cubic root of 61500150 is about 394.7226595606.

Adding to 61500150 its reverse (5100516), we get a palindrome (66600666).

The spelling of 61500150 in words is "sixty-one million, five hundred thousand, one hundred fifty".