201243500139401 has 2 divisors, whose sum is σ = 201243500139402. Its totient is φ = 201243500139400.

The previous prime is 201243500139379. The next prime is 201243500139457. The reversal of 201243500139401 is 104931005342102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200277405763600 + 966094375801 = 14151940^2 + 982901^2 .

It is a cyclic number.

It is not a de Polignac number, because 201243500139401 - 2⁶ = 201243500139337 is a prime.

It is not a weakly prime, because it can be changed into another prime (201243500139301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100621750069700 + 100621750069701.

It is an arithmetic number, because the mean of its divisors is an integer number (100621750069701).

Almost surely, 2^{201243500139401} is an apocalyptic number.

It is an amenable number.

201243500139401 is a deficient number, since it is larger than the sum of its proper divisors (1).

201243500139401 is an equidigital number, since it uses as much as digits as its factorization.

201243500139401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 201243500139401 in words is "two hundred one trillion, two hundred forty-three billion, five hundred million, one hundred thirty-nine thousand, four hundred one".