1201554121 has 2 divisors, whose sum is σ = 1201554122. Its totient is φ = 1201554120.

The previous prime is 1201554119. The next prime is 1201554181. The reversal of 1201554121 is 1214551021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1076561721 + 124992400 = 32811^2 + 11180^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201554121 - 2¹ = 1201554119 is a prime.

Together with 1201554119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1201554092 and 1201554101.

It is not a weakly prime, because it can be changed into another prime (1201554181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600777060 + 600777061.

It is an arithmetic number, because the mean of its divisors is an integer number (600777061).

Almost surely, 2^1201554121 is an apocalyptic number.

It is an amenable number.

1201554121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201554121 is an equidigital number, since it uses as much as digits as its factorization.

1201554121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 400, while the sum is 22.

The square root of 1201554121 is about 34663.4406976572. The cubic root of 1201554121 is about 1063.1171212820.

The spelling of 1201554121 in words is "one billion, two hundred one million, five hundred fifty-four thousand, one hundred twenty-one".