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10100999981 is a prime number
BaseRepresentation
bin10010110100001000…
…10000011100101101
3222001221210222001102
421122010100130231
5131141323444411
64350151252445
7505212040352
oct113204203455
928057728042
1010100999981
114313829876
121b5a97a125
13c4c8c1187
146bb734629
153e1badd3b
hex25a11072d

10100999981 has 2 divisors, whose sum is σ = 10100999982. Its totient is φ = 10100999980.

The previous prime is 10100999969. The next prime is 10101000023. The reversal of 10100999981 is 18999900101.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9565818025 + 535181956 = 97805^2 + 23134^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-10100999981 is a prime.

It is a super-2 number, since 2×101009999812 (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10100999911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050499990 + 5050499991.

It is an arithmetic number, because the mean of its divisors is an integer number (5050499991).

Almost surely, 210100999981 is an apocalyptic number.

It is an amenable number.

10100999981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10100999981 is an equidigital number, since it uses as much as digits as its factorization.

10100999981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 10100999981 in words is "ten billion, one hundred million, nine hundred ninety-nine thousand, nine hundred eighty-one".