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99981437 = 1723376911
BaseRepresentation
bin1011111010110…
…01100001111101
320222010120202012
411331121201331
5201043401222
613530541005
72322554033
oct575314175
9228116665
1099981437
1151489596
1229597765
131793821a
14d3c8553
158b9e1e2
hex5f5987d

99981437 has 16 divisors (see below), whose sum is σ = 113467392. Its totient is φ = 87563520.

The previous prime is 99981421. The next prime is 99981451. The reversal of 99981437 is 73418999.

It is a cyclic number.

It is not a de Polignac number, because 99981437 - 24 = 99981421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99981467) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11012 + ... + 17922.

It is an arithmetic number, because the mean of its divisors is an integer number (7091712).

Almost surely, 299981437 is an apocalyptic number.

It is an amenable number.

99981437 is a deficient number, since it is larger than the sum of its proper divisors (13485955).

99981437 is a wasteful number, since it uses less digits than its factorization.

99981437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6988.

The product of its digits is 489888, while the sum is 50.

The square root of 99981437 is about 9999.0718069229. The cubic root of 99981437 is about 464.1301609795.

The spelling of 99981437 in words is "ninety-nine million, nine hundred eighty-one thousand, four hundred thirty-seven".

Divisors: 1 17 23 37 391 629 851 6911 14467 117487 158953 255707 2702201 4347019 5881261 99981437