1891298257201 has 4 divisors (see below), whose sum is σ = 1893796670452. Its totient is φ = 1888799843952.

The previous prime is 1891298257193. The next prime is 1891298257217. The reversal of 1891298257201 is 1027528921981.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1566124599601 + 325173657600 = 1251449^2 + 570240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1891298257201 - 2³ = 1891298257193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1891298251201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1249205490 + ... + 1249207003.

It is an arithmetic number, because the mean of its divisors is an integer number (473449167613).

Almost surely, 2^{1891298257201} is an apocalyptic number.

It is an amenable number.

1891298257201 is a deficient number, since it is larger than the sum of its proper divisors (2498413251).

1891298257201 is an equidigital number, since it uses as much as digits as its factorization.

1891298257201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2498413250.

The product of its (nonzero) digits is 1451520, while the sum is 55.

The spelling of 1891298257201 in words is "one trillion, eight hundred ninety-one billion, two hundred ninety-eight million, two hundred fifty-seven thousand, two hundred one".