1011223156901 has 2 divisors, whose sum is σ = 1011223156902. Its totient is φ = 1011223156900.

The previous prime is 1011223156897. The next prime is 1011223156963. The reversal of 1011223156901 is 1096513221101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986791903876 + 24431253025 = 993374^2 + 156305^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011223156901 - 2² = 1011223156897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011223156501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505611578450 + 505611578451.

It is an arithmetic number, because the mean of its divisors is an integer number (505611578451).

Almost surely, 2^{1011223156901} is an apocalyptic number.

It is an amenable number.

1011223156901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011223156901 is an equidigital number, since it uses as much as digits as its factorization.

1011223156901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 32.

The spelling of 1011223156901 in words is "one trillion, eleven billion, two hundred twenty-three million, one hundred fifty-six thousand, nine hundred one".