121402591 has 2 divisors, whose sum is σ = 121402592. Its totient is φ = 121402590.

The previous prime is 121402583. The next prime is 121402607. The reversal of 121402591 is 195204121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121402591 - 2³ = 121402583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121402691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60701295 + 60701296.

It is an arithmetic number, because the mean of its divisors is an integer number (60701296).

Almost surely, 2^121402591 is an apocalyptic number.

121402591 is a deficient number, since it is larger than the sum of its proper divisors (1).

121402591 is an equidigital number, since it uses as much as digits as its factorization.

121402591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 121402591 is about 11018.2843945870. The cubic root of 121402591 is about 495.1566908634.

The spelling of 121402591 in words is "one hundred twenty-one million, four hundred two thousand, five hundred ninety-one".