121558001 has 2 divisors, whose sum is σ = 121558002. Its totient is φ = 121558000.

The previous prime is 121557983. The next prime is 121558039. The reversal of 121558001 is 100855121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104550625 + 17007376 = 10225^2 + 4124^2 .

It is a cyclic number.

It is not a de Polignac number, because 121558001 - 2¹⁰ = 121556977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (121558091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60779000 + 60779001.

It is an arithmetic number, because the mean of its divisors is an integer number (60779001).

Almost surely, 2^121558001 is an apocalyptic number.

It is an amenable number.

121558001 is a deficient number, since it is larger than the sum of its proper divisors (1).

121558001 is an equidigital number, since it uses as much as digits as its factorization.

121558001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 121558001 is about 11025.3345073970. The cubic root of 121558001 is about 495.3678875875.

The spelling of 121558001 in words is "one hundred twenty-one million, five hundred fifty-eight thousand, one".