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991898000133 = 36128279191669
BaseRepresentation
bin11100110111100011011…
…10100101101100000101
310111211021002002012001220
432123301232211230011
5112222401342001013
62035401024310553
7131443104614115
oct16336156455405
93454232065056
10991898000133
11352730620537
121402a0772459
13726c6891891
14360183cb045
151ac0531db23
hexe6f1ba5b05

991898000133 has 16 divisors (see below), whose sum is σ = 1344266044800. Its totient is φ = 650398524480.

The previous prime is 991898000131. The next prime is 991898000201. The reversal of 991898000133 is 331000898199.

It is a happy number.

It is not a de Polignac number, because 991898000133 - 21 = 991898000131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991898000131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5079223 + ... + 5270891.

It is an arithmetic number, because the mean of its divisors is an integer number (84016627800).

Almost surely, 2991898000133 is an apocalyptic number.

991898000133 is the 575007-th octagonal number.

It is an amenable number.

991898000133 is a deficient number, since it is larger than the sum of its proper divisors (352368044667).

991898000133 is a wasteful number, since it uses less digits than its factorization.

991898000133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220012.

The product of its (nonzero) digits is 419904, while the sum is 51.

The spelling of 991898000133 in words is "nine hundred ninety-one billion, eight hundred ninety-eight million, one hundred thirty-three", and thus it is an aban number.