61115500 has 24 divisors (see below), whose sum is σ = 133477344. Its totient is φ = 24446000.

The previous prime is 61115497. The next prime is 61115503. The reversal of 61115500 is 551116.

61115500 is nontrivially palindromic in base 9.

It is an interprime number because it is at equal distance from previous prime (61115497) and next prime (61115503).

It is not an unprimeable number, because it can be changed into a prime (61115503) 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, 60616 + ... + 61615.

It is an arithmetic number, because the mean of its divisors is an integer number (5561556).

Almost surely, 2^61115500 is an apocalyptic number.

It is an amenable number.

61115500 is an abundant number, since it is smaller than the sum of its proper divisors (72361844).

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

61115500 is a wasteful number, since it uses less digits than its factorization.

61115500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122250 (or 122238 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 61115500 is about 7817.6403089423. The cubic root of 61115500 is about 393.8980127174.

Adding to 61115500 its reverse (551116), we get a palindrome (61666616).

It can be divided in two parts, 6111 and 5500, that added together give a palindrome (11611).

The spelling of 61115500 in words is "sixty-one million, one hundred fifteen thousand, five hundred".