1691100221241 has 4 divisors (see below), whose sum is σ = 2254800294992. Its totient is φ = 1127400147492.

The previous prime is 1691100221233. The next prime is 1691100221281. The reversal of 1691100221241 is 1421220011961.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1691100221241 - 2³ = 1691100221233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1691100221199 and 1691100221208.

It is not an unprimeable number, because it can be changed into a prime (1691100221221) 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, 281850036871 + ... + 281850036876.

It is an arithmetic number, because the mean of its divisors is an integer number (563700073748).

Almost surely, 2^{1691100221241} is an apocalyptic number.

It is an amenable number.

1691100221241 is a deficient number, since it is larger than the sum of its proper divisors (563700073751).

1691100221241 is an equidigital number, since it uses as much as digits as its factorization.

1691100221241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 563700073750.

The product of its (nonzero) digits is 1728, while the sum is 30.

The spelling of 1691100221241 in words is "one trillion, six hundred ninety-one billion, one hundred million, two hundred twenty-one thousand, two hundred forty-one".