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81698863 is a prime number
BaseRepresentation
bin1001101111010…
…10000000101111
312200201201202211
410313222000233
5131403330423
612035031251
72011300051
oct467520057
9180651684
1081698863
1142131624
122343b527
1313c0672c
14abc98d1
15728c10d
hex4dea02f

81698863 has 2 divisors, whose sum is σ = 81698864. Its totient is φ = 81698862.

The previous prime is 81698807. The next prime is 81698867. The reversal of 81698863 is 36889618.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-81698863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81698867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40849431 + 40849432.

It is an arithmetic number, because the mean of its divisors is an integer number (40849432).

Almost surely, 281698863 is an apocalyptic number.

81698863 is a deficient number, since it is larger than the sum of its proper divisors (1).

81698863 is an equidigital number, since it uses as much as digits as its factorization.

81698863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 49.

The square root of 81698863 is about 9038.7423350818. The cubic root of 81698863 is about 433.9156734094.

The spelling of 81698863 in words is "eighty-one million, six hundred ninety-eight thousand, eight hundred sixty-three".