121653401 has 2 divisors, whose sum is σ = 121653402. Its totient is φ = 121653400.

The previous prime is 121653359. The next prime is 121653419. The reversal of 121653401 is 104356121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 110229001 + 11424400 = 10499^2 + 3380^2 .

It is a cyclic number.

It is not a de Polignac number, because 121653401 - 2¹⁴ = 121637017 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (121653451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60826700 + 60826701.

It is an arithmetic number, because the mean of its divisors is an integer number (60826701).

Almost surely, 2^121653401 is an apocalyptic number.

It is an amenable number.

121653401 is a deficient number, since it is larger than the sum of its proper divisors (1).

121653401 is an equidigital number, since it uses as much as digits as its factorization.

121653401 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 23.

The square root of 121653401 is about 11029.6600582248. The cubic root of 121653401 is about 495.4974436804.

The spelling of 121653401 in words is "one hundred twenty-one million, six hundred fifty-three thousand, four hundred one".