275187721990397 has 2 divisors, whose sum is σ = 275187721990398. Its totient is φ = 275187721990396.

The previous prime is 275187721990387. The next prime is 275187721990439. The reversal of 275187721990397 is 793099127781572.

275187721990397 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 168734150632441 + 106453571357956 = 12989771^2 + 10317634^2 .

It is a cyclic number.

It is not a de Polignac number, because 275187721990397 - 2¹² = 275187721986301 is a prime.

It is a super-2 number, since 2×275187721990397² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (275187721990387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 137593860995198 + 137593860995199.

It is an arithmetic number, because the mean of its divisors is an integer number (137593860995199).

Almost surely, 2^{275187721990397} is an apocalyptic number.

It is an amenable number.

275187721990397 is a deficient number, since it is larger than the sum of its proper divisors (1).

275187721990397 is an equidigital number, since it uses as much as digits as its factorization.

275187721990397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840157920, while the sum is 77.

The spelling of 275187721990397 in words is "two hundred seventy-five trillion, one hundred eighty-seven billion, seven hundred twenty-one million, nine hundred ninety thousand, three hundred ninety-seven".