Search a number
BaseRepresentation
bin1100001011000…
…11111010010101
321010011021211022
412011203322111
5202120333414
614044450525
72350005116
oct605437225
9233137738
10102121109
1152710112
122a249a45
13182070bc
14d7c420d
158e7318e
hex6163e95

102121109 has 2 divisors, whose sum is σ = 102121110. Its totient is φ = 102121108.

The previous prime is 102121069. The next prime is 102121133. The reversal of 102121109 is 901121201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101566084 + 555025 = 10078^2 + 745^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-102121109 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102121139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51060554 + 51060555.

It is an arithmetic number, because the mean of its divisors is an integer number (51060555).

Almost surely, 2102121109 is an apocalyptic number.

It is an amenable number.

102121109 is a deficient number, since it is larger than the sum of its proper divisors (1).

102121109 is an equidigital number, since it uses as much as digits as its factorization.

102121109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 102121109 is about 10105.4989485923. The cubic root of 102121109 is about 467.4177216102.

The spelling of 102121109 in words is "one hundred two million, one hundred twenty-one thousand, one hundred nine".