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1631109989 is a prime number
BaseRepresentation
bin110000100111000…
…1100001101100101
311012200012222021002
41201032030031211
511320031004424
6425504203045
755264130465
oct14116141545
94180188232
101631109989
117677a0093
12396309485
131ccc09052
141168b1ba5
15982e6cae
hex6138c365

1631109989 has 2 divisors, whose sum is σ = 1631109990. Its totient is φ = 1631109988.

The previous prime is 1631109973. The next prime is 1631110027. The reversal of 1631109989 is 9899011361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1171350625 + 459759364 = 34225^2 + 21442^2 .

It is a cyclic number.

It is not a de Polignac number, because 1631109989 - 24 = 1631109973 is a prime.

It is a Sophie Germain 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 (1631109289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815554994 + 815554995.

It is an arithmetic number, because the mean of its divisors is an integer number (815554995).

Almost surely, 21631109989 is an apocalyptic number.

It is an amenable number.

1631109989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1631109989 is an equidigital number, since it uses as much as digits as its factorization.

1631109989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 1631109989 is about 40387.0027236486. The cubic root of 1631109989 is about 1177.1390013428.

The spelling of 1631109989 in words is "one billion, six hundred thirty-one million, one hundred nine thousand, nine hundred eighty-nine".