1197709391 has 4 divisors (see below), whose sum is σ = 1201971984. Its totient is φ = 1193446800.

The previous prime is 1197709379. The next prime is 1197709411. The reversal of 1197709391 is 1939077911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1939077911 = 38327 ⋅50593.

It is a cyclic number.

It is not a de Polignac number, because 1197709391 - 2¹⁰ = 1197708367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1197709361) 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, 2130875 + ... + 2131436.

It is an arithmetic number, because the mean of its divisors is an integer number (300492996).

Almost surely, 2^1197709391 is an apocalyptic number.

1197709391 is a deficient number, since it is larger than the sum of its proper divisors (4262593).

1197709391 is an equidigital number, since it uses as much as digits as its factorization.

1197709391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4262592.

The product of its (nonzero) digits is 107163, while the sum is 47.

The square root of 1197709391 is about 34607.9382656638. The cubic root of 1197709391 is about 1061.9819898161.

The spelling of 1197709391 in words is "one billion, one hundred ninety-seven million, seven hundred nine thousand, three hundred ninety-one".