1691417121 has 8 divisors (see below), whose sum is σ = 2255421984. Its totient is φ = 1127511840.

The previous prime is 1691417087. The next prime is 1691417131. The reversal of 1691417121 is 1217141961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1691417121 - 2¹⁵ = 1691384353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1691417131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36066 + ... + 68436.

It is an arithmetic number, because the mean of its divisors is an integer number (281927748).

Almost surely, 2^1691417121 is an apocalyptic number.

It is an amenable number.

1691417121 is a deficient number, since it is larger than the sum of its proper divisors (564004863).

1691417121 is a wasteful number, since it uses less digits than its factorization.

1691417121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49791.

The product of its digits is 3024, while the sum is 33.

The square root of 1691417121 is about 41126.8418554112. The cubic root of 1691417121 is about 1191.4712685268.

The spelling of 1691417121 in words is "one billion, six hundred ninety-one million, four hundred seventeen thousand, one hundred twenty-one".