61156100 has 18 divisors (see below), whose sum is σ = 132708954. Its totient is φ = 24462400.

The previous prime is 61156097. The next prime is 61156111. The reversal of 61156100 is 165116.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 19061956 + 42094144 = 4366^2 + 6488^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 305681 + ... + 305880.

Almost surely, 2^61156100 is an apocalyptic number.

It is an amenable number.

61156100 is an abundant number, since it is smaller than the sum of its proper divisors (71552854).

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

61156100 is a wasteful number, since it uses less digits than its factorization.

61156100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611575 (or 611568 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 61156100 is about 7820.2365693117. The cubic root of 61156100 is about 393.9852176508.

The spelling of 61156100 in words is "sixty-one million, one hundred fifty-six thousand, one hundred".