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99870031 is a prime number
BaseRepresentation
bin1011111001111…
…10010101001111
320221220220221001
411330332111033
5201031320111
613524321131
72321611162
oct574762517
9227826831
1099870031
1151412918
12295431a7
13178c95c1
14d399ad9
158b7b1c1
hex5f3e54f

99870031 has 2 divisors, whose sum is σ = 99870032. Its totient is φ = 99870030.

The previous prime is 99870011. The next prime is 99870047. The reversal of 99870031 is 13007899.

It is a strong prime.

It is an emirp because it is prime and its reverse (13007899) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-99870031 is a prime.

It is a super-2 number, since 2×998700312 = 19948046183881922, which contains 22 as substring.

It is a Chen prime.

It is equal to p5754367 and since 99870031 and 5754367 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99870011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49935015 + 49935016.

It is an arithmetic number, because the mean of its divisors is an integer number (49935016).

Almost surely, 299870031 is an apocalyptic number.

99870031 is a deficient number, since it is larger than the sum of its proper divisors (1).

99870031 is an equidigital number, since it uses as much as digits as its factorization.

99870031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 99870031 is about 9993.4994371341. The cubic root of 99870031 is about 463.9577086281.

The spelling of 99870031 in words is "ninety-nine million, eight hundred seventy thousand, thirty-one".