1121651898 has 16 divisors (see below), whose sum is σ = 2291034240. Its totient is φ = 365928896.

The previous prime is 1121651849. The next prime is 1121651903. The reversal of 1121651898 is 8981561211.

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, 1988463 + ... + 1989026.

It is an arithmetic number, because the mean of its divisors is an integer number (143189640).

Almost surely, 2^1121651898 is an apocalyptic number.

1121651898 is an abundant number, since it is smaller than the sum of its proper divisors (1169382342).

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

1121651898 is a wasteful number, since it uses less digits than its factorization.

1121651898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3977541.

The product of its digits is 34560, while the sum is 42.

The square root of 1121651898 is about 33491.0719147656. The cubic root of 1121651898 is about 1039.0091332915.

The spelling of 1121651898 in words is "one billion, one hundred twenty-one million, six hundred fifty-one thousand, eight hundred ninety-eight".