1201225951901 has 2 divisors, whose sum is σ = 1201225951902. Its totient is φ = 1201225951900.

The previous prime is 1201225951841. The next prime is 1201225952039. The reversal of 1201225951901 is 1091595221021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 629402635801 + 571823316100 = 793349^2 + 756190^2 .

It is an emirp because it is prime and its reverse (1091595221021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1201225951901 - 2¹⁴ = 1201225935517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201225951001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600612975950 + 600612975951.

It is an arithmetic number, because the mean of its divisors is an integer number (600612975951).

Almost surely, 2^{1201225951901} is an apocalyptic number.

It is an amenable number.

1201225951901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201225951901 is an equidigital number, since it uses as much as digits as its factorization.

1201225951901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16200, while the sum is 38.

The spelling of 1201225951901 in words is "one trillion, two hundred one billion, two hundred twenty-five million, nine hundred fifty-one thousand, nine hundred one".