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243121245397 is a prime number
BaseRepresentation
bin1110001001101100100…
…1111100110011010101
3212020112112111220202021
43202123021330303111
512440403014323042
6303404404013141
723364525326422
oct3423311746325
9766475456667
10243121245397
119411a672098
123b1509911b1
1319c06c279b4
14baa5016d49
1564cde9e867
hex389b27ccd5

243121245397 has 2 divisors, whose sum is σ = 243121245398. Its totient is φ = 243121245396.

The previous prime is 243121245347. The next prime is 243121245421. The reversal of 243121245397 is 793542121342.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241819046001 + 1302199396 = 491751^2 + 36086^2 .

It is a cyclic number.

It is not a de Polignac number, because 243121245397 - 235 = 208761507029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243121245347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121560622698 + 121560622699.

It is an arithmetic number, because the mean of its divisors is an integer number (121560622699).

Almost surely, 2243121245397 is an apocalyptic number.

It is an amenable number.

243121245397 is a deficient number, since it is larger than the sum of its proper divisors (1).

243121245397 is an equidigital number, since it uses as much as digits as its factorization.

243121245397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 362880, while the sum is 43.

The spelling of 243121245397 in words is "two hundred forty-three billion, one hundred twenty-one million, two hundred forty-five thousand, three hundred ninety-seven".