1191678097 has 4 divisors (see below), whose sum is σ = 1192832740. Its totient is φ = 1190523456.

The previous prime is 1191678029. The next prime is 1191678101. The reversal of 1191678097 is 7908761911.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 544942336 + 646735761 = 23344^2 + 25431^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191678097 - 2¹⁹ = 1191153809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1191678097.

It is not an unprimeable number, because it can be changed into a prime (1191178097) 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, 575772 + ... + 577837.

It is an arithmetic number, because the mean of its divisors is an integer number (298208185).

Almost surely, 2^1191678097 is an apocalyptic number.

It is an amenable number.

1191678097 is a deficient number, since it is larger than the sum of its proper divisors (1154643).

1191678097 is a wasteful number, since it uses less digits than its factorization.

1191678097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154642.

The product of its (nonzero) digits is 190512, while the sum is 49.

The square root of 1191678097 is about 34520.6908534577. The cubic root of 1191678097 is about 1060.1963849381.

The spelling of 1191678097 in words is "one billion, one hundred ninety-one million, six hundred seventy-eight thousand, ninety-seven".