1961561184 has 96 divisors (see below), whose sum is σ = 5947675776. Its totient is φ = 559441920.

The previous prime is 1961561113. The next prime is 1961561209. The reversal of 1961561184 is 4811651691.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36682 + ... + 72585.

It is an arithmetic number, because the mean of its divisors is an integer number (61954956).

Almost surely, 2^1961561184 is an apocalyptic number.

It is an amenable number.

1961561184 is an abundant number, since it is smaller than the sum of its proper divisors (3986114592).

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

1961561184 is a wasteful number, since it uses less digits than its factorization.

1961561184 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109308 (or 109300 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The square root of 1961561184 is about 44289.5155087522. The cubic root of 1961561184 is about 1251.7971342619.

The spelling of 1961561184 in words is "one billion, nine hundred sixty-one million, five hundred sixty-one thousand, one hundred eighty-four".