121236491 has 2 divisors, whose sum is σ = 121236492. Its totient is φ = 121236490.

The previous prime is 121236487. The next prime is 121236527. The reversal of 121236491 is 194632121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121236491 - 2² = 121236487 is a prime.

It is not a weakly prime, because it can be changed into another prime (121236431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60618245 + 60618246.

It is an arithmetic number, because the mean of its divisors is an integer number (60618246).

Almost surely, 2^121236491 is an apocalyptic number.

121236491 is a deficient number, since it is larger than the sum of its proper divisors (1).

121236491 is an equidigital number, since it uses as much as digits as its factorization.

121236491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 121236491 is about 11010.7443435946. The cubic root of 121236491 is about 494.9307674489.

The spelling of 121236491 in words is "one hundred twenty-one million, two hundred thirty-six thousand, four hundred ninety-one".