121051391 has 2 divisors, whose sum is σ = 121051392. Its totient is φ = 121051390.

The previous prime is 121051361. The next prime is 121051397. The reversal of 121051391 is 193150121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 121051391 - 2⁶ = 121051327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121051397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60525695 + 60525696.

It is an arithmetic number, because the mean of its divisors is an integer number (60525696).

Almost surely, 2^121051391 is an apocalyptic number.

121051391 is a deficient number, since it is larger than the sum of its proper divisors (1).

121051391 is an equidigital number, since it uses as much as digits as its factorization.

121051391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 121051391 is about 11002.3357065670. The cubic root of 121051391 is about 494.6787576589.

The spelling of 121051391 in words is "one hundred twenty-one million, fifty-one thousand, three hundred ninety-one".