61019900 has 18 divisors (see below), whose sum is σ = 132413400. Its totient is φ = 24407920.

The previous prime is 61019899. The next prime is 61019911. The reversal of 61019900 is 991016.

It is a self number, because there is not a number n which added to its sum of digits gives 61019900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 305000 + ... + 305199.

It is an arithmetic number, because the mean of its divisors is an integer number (7356300).

Almost surely, 2^61019900 is an apocalyptic number.

It is an amenable number.

61019900 is an abundant number, since it is smaller than the sum of its proper divisors (71393500).

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

61019900 is a wasteful number, since it uses less digits than its factorization.

61019900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610213 (or 610206 counting only the distinct ones).

The product of its (nonzero) digits is 486, while the sum is 26.

The square root of 61019900 is about 7811.5235389775. The cubic root of 61019900 is about 393.6925203741.

The spelling of 61019900 in words is "sixty-one million, nineteen thousand, nine hundred".