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9978131 is a prime number
BaseRepresentation
bin100110000100…
…000100010011
3200202221102102
4212010010103
510023300011
6553511015
7150545522
oct46040423
920687372
109978131
1156a5799
12341246b
1320b4927
14147a4b9
15d2173b
hex984113

9978131 has 2 divisors, whose sum is σ = 9978132. Its totient is φ = 9978130.

The previous prime is 9978119. The next prime is 9978169. The reversal of 9978131 is 1318799.

It is an a-pointer prime, because the next prime (9978169) can be obtained adding 9978131 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-9978131 is a prime.

It is a super-2 number, since 2×99781312 = 199126196506322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9978191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4989065 + 4989066.

It is an arithmetic number, because the mean of its divisors is an integer number (4989066).

Almost surely, 29978131 is an apocalyptic number.

9978131 is a deficient number, since it is larger than the sum of its proper divisors (1).

9978131 is an equidigital number, since it uses as much as digits as its factorization.

9978131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 38.

The square root of 9978131 is about 3158.8179751293. The cubic root of 9978131 is about 215.2863032714.

The spelling of 9978131 in words is "nine million, nine hundred seventy-eight thousand, one hundred thirty-one".