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102231991 is a prime number
BaseRepresentation
bin1100001011111…
…10111110110111
321010100220221001
412011332332313
5202132410431
614051104131
72350646311
oct605767667
9233326831
10102231991
1152786454
122a2a2047
1318245704
14d8127b1
158e95e61
hex617efb7

102231991 has 2 divisors, whose sum is σ = 102231992. Its totient is φ = 102231990.

The previous prime is 102231971. The next prime is 102232001. The reversal of 102231991 is 199132201.

It is a strong prime.

It is an emirp because it is prime and its reverse (199132201) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 102231991 - 217 = 102100919 is a prime.

It is a super-3 number, since 3×1022319913 (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102231971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51115995 + 51115996.

It is an arithmetic number, because the mean of its divisors is an integer number (51115996).

Almost surely, 2102231991 is an apocalyptic number.

102231991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102231991 is an equidigital number, since it uses as much as digits as its factorization.

102231991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 102231991 is about 10110.9836811262. The cubic root of 102231991 is about 467.5868327941.

The spelling of 102231991 in words is "one hundred two million, two hundred thirty-one thousand, nine hundred ninety-one".