1691441961 has 8 divisors (see below), whose sum is σ = 2460279264. Its totient is φ = 1025116320.

The previous prime is 1691441953. The next prime is 1691441963.

1691441961 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 1691441961 - 2³ = 1691441953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1691441963) 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, 25627876 + ... + 25627941.

It is an arithmetic number, because the mean of its divisors is an integer number (307534908).

Almost surely, 2^1691441961 is an apocalyptic number.

1691441961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1691441961 is a deficient number, since it is larger than the sum of its proper divisors (768837303).

1691441961 is a wasteful number, since it uses less digits than its factorization.

1691441961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51255831.

The product of its digits is 46656, while the sum is 42.

The square root of 1691441961 is about 41127.1438468562. The cubic root of 1691441961 is about 1191.4771011116.

The spelling of 1691441961 in words is "one billion, six hundred ninety-one million, four hundred forty-one thousand, nine hundred sixty-one".