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999978000121 = 192526312
BaseRepresentation
bin11101000110100110101…
…01010101111011111001
310112121010012000201022201
432203103111111323321
5112340423332000441
62043214502550201
7132150246520312
oct16432325257371
93477105021281
10999978000121
113560a756a081
12141976738361
13733b3865069
143658355b609
151b02986cc31
hexe8d3555ef9

999978000121 has 9 divisors (see below), whose sum is σ = 1055398496133. Its totient is φ = 947329579260.

The previous prime is 999978000113. The next prime is 999978000139. The reversal of 999978000121 is 121000879999.

The square root of 999978000121 is 999989.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 999978000121 - 23 = 999978000113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (999978000521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 18973476 + ... + 19026106.

Almost surely, 2999978000121 is an apocalyptic number.

999978000121 is the 999989-th square number.

999978000121 is the 499995-th centered octagonal number.

It is an amenable number.

999978000121 is a deficient number, since it is larger than the sum of its proper divisors (55420496012).

999978000121 is an frugal number, since it uses more digits than its factorization.

999978000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105300 (or 52650 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 55.

The spelling of 999978000121 in words is "nine hundred ninety-nine billion, nine hundred seventy-eight million, one hundred twenty-one", and thus it is an aban number.

Divisors: 1 19 361 52631 999989 18999791 2770022161 52630421059 999978000121