1197081391 has 32 divisors (see below), whose sum is σ = 1395947520. Its totient is φ = 1015872000.

The previous prime is 1197081383. The next prime is 1197081409. The reversal of 1197081391 is 1931807911.

It is not a de Polignac number, because 1197081391 - 2³ = 1197081383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1197081311) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2018391 + ... + 2018983.

It is an arithmetic number, because the mean of its divisors is an integer number (43623360).

Almost surely, 2^1197081391 is an apocalyptic number.

1197081391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1197081391 is a deficient number, since it is larger than the sum of its proper divisors (198866129).

1197081391 is a wasteful number, since it uses less digits than its factorization.

1197081391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807.

The product of its (nonzero) digits is 13608, while the sum is 40.

The square root of 1197081391 is about 34598.8640131436. The cubic root of 1197081391 is about 1061.7963462055.

The spelling of 1197081391 in words is "one billion, one hundred ninety-seven million, eighty-one thousand, three hundred ninety-one".