121275391 has 2 divisors, whose sum is σ = 121275392. Its totient is φ = 121275390.

The previous prime is 121275377. The next prime is 121275397. The reversal of 121275391 is 193572121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121275391 - 2¹¹ = 121273343 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121275397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60637695 + 60637696.

It is an arithmetic number, because the mean of its divisors is an integer number (60637696).

Almost surely, 2^121275391 is an apocalyptic number.

121275391 is a deficient number, since it is larger than the sum of its proper divisors (1).

121275391 is an equidigital number, since it uses as much as digits as its factorization.

121275391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 31.

The square root of 121275391 is about 11012.5106583376. The cubic root of 121275391 is about 494.9836963647.

The spelling of 121275391 in words is "one hundred twenty-one million, two hundred seventy-five thousand, three hundred ninety-one".