1198947691 has 8 divisors (see below), whose sum is σ = 1217226240. Its totient is φ = 1180807488.

The previous prime is 1198947679. The next prime is 1198947727. The reversal of 1198947691 is 1967498911.

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

It is a cyclic number.

It is not a de Polignac number, because 1198947691 - 2¹³ = 1198939499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1198947601) 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, 17056 + ... + 51853.

It is an arithmetic number, because the mean of its divisors is an integer number (152153280).

Almost surely, 2^1198947691 is an apocalyptic number.

1198947691 is a deficient number, since it is larger than the sum of its proper divisors (18278549).

1198947691 is a wasteful number, since it uses less digits than its factorization.

1198947691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69173.

The product of its digits is 979776, while the sum is 55.

The square root of 1198947691 is about 34625.8240479559. The cubic root of 1198947691 is about 1062.3478546805.

The spelling of 1198947691 in words is "one billion, one hundred ninety-eight million, nine hundred forty-seven thousand, six hundred ninety-one".