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121997387 is a prime number
BaseRepresentation
bin1110100010110…
…00100001001011
322111120002221202
413101120201023
5222212404022
620034454415
73010650341
oct721304113
9274502852
10121997387
1162956496
1234a3440b
131c376105
14122b9991
15aa9c592
hex745884b

121997387 has 2 divisors, whose sum is σ = 121997388. Its totient is φ = 121997386.

The previous prime is 121997371. The next prime is 121997417. The reversal of 121997387 is 783799121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121997387 - 24 = 121997371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121997357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60998693 + 60998694.

It is an arithmetic number, because the mean of its divisors is an integer number (60998694).

Almost surely, 2121997387 is an apocalyptic number.

121997387 is a deficient number, since it is larger than the sum of its proper divisors (1).

121997387 is an equidigital number, since it uses as much as digits as its factorization.

121997387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 47.

The square root of 121997387 is about 11045.2427316017. The cubic root of 121997387 is about 495.9640254758.

The spelling of 121997387 in words is "one hundred twenty-one million, nine hundred ninety-seven thousand, three hundred eighty-seven".