9618961812 has 24 divisors (see below), whose sum is σ = 23625520800. Its totient is φ = 3037566816.

The previous prime is 9618961799. The next prime is 9618961829. The reversal of 9618961812 is 2181698169.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21093987 + ... + 21094442.

It is an arithmetic number, because the mean of its divisors is an integer number (984396700).

Almost surely, 2^9618961812 is an apocalyptic number.

It is an amenable number.

9618961812 is an abundant number, since it is smaller than the sum of its proper divisors (14006558988).

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

9618961812 is a wasteful number, since it uses less digits than its factorization.

9618961812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42188455 (or 42188453 counting only the distinct ones).

The product of its digits is 373248, while the sum is 51.

The square root of 9618961812 is about 98076.3060682854. The cubic root of 9618961812 is about 2126.7155189144.

The spelling of 9618961812 in words is "nine billion, six hundred eighteen million, nine hundred sixty-one thousand, eight hundred twelve".