1161931197 has 16 divisors (see below), whose sum is σ = 1831616640. Its totient is φ = 641065152.

The previous prime is 1161931189. The next prime is 1161931231. The reversal of 1161931197 is 7911391611.

It is not a de Polignac number, because 1161931197 - 2³ = 1161931189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161939197) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 953358 + ... + 954575.

It is an arithmetic number, because the mean of its divisors is an integer number (114476040).

Almost surely, 2^1161931197 is an apocalyptic number.

It is an amenable number.

1161931197 is a deficient number, since it is larger than the sum of its proper divisors (669685443).

1161931197 is a wasteful number, since it uses less digits than its factorization.

1161931197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907972.

The product of its digits is 10206, while the sum is 39.

The square root of 1161931197 is about 34087.1118899798. Note that the first 3 decimals coincide. The cubic root of 1161931197 is about 1051.3003381803.

The spelling of 1161931197 in words is "one billion, one hundred sixty-one million, nine hundred thirty-one thousand, one hundred ninety-seven".