61231500 has 144 divisors (see below), whose sum is σ = 210895776. Its totient is φ = 14832000.

The previous prime is 61231487. The next prime is 61231517. The reversal of 61231500 is 513216.

61231500 is a `hidden beast` number, since 612 + 3 + 1 + 50 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48882 + ... + 50118.

It is an arithmetic number, because the mean of its divisors is an integer number (1464554).

Almost surely, 2^61231500 is an apocalyptic number.

61231500 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61231500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105447888).

61231500 is an abundant number, since it is smaller than the sum of its proper divisors (149664276).

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

61231500 is a wasteful number, since it uses less digits than its factorization.

61231500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1273 (or 1258 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 61231500 is about 7825.0559103434. The cubic root of 61231500 is about 394.1470673288.

Adding to 61231500 its reverse (513216), we get a palindrome (61744716).

The spelling of 61231500 in words is "sixty-one million, two hundred thirty-one thousand, five hundred".