1201022351261 has 2 divisors, whose sum is σ = 1201022351262. Its totient is φ = 1201022351260.

The previous prime is 1201022351237. The next prime is 1201022351359. The reversal of 1201022351261 is 1621532201021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 802110107236 + 398912244025 = 895606^2 + 631595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201022351261 - 2⁶ = 1201022351197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1201022351261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201022351161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600511175630 + 600511175631.

It is an arithmetic number, because the mean of its divisors is an integer number (600511175631).

Almost surely, 2^{1201022351261} is an apocalyptic number.

It is an amenable number.

1201022351261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201022351261 is an equidigital number, since it uses as much as digits as its factorization.

1201022351261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

Adding to 1201022351261 its reverse (1621532201021), we get a palindrome (2822554552282).

The spelling of 1201022351261 in words is "one trillion, two hundred one billion, twenty-two million, three hundred fifty-one thousand, two hundred sixty-one".