1191471973 has 2 divisors, whose sum is σ = 1191471974. Its totient is φ = 1191471972.

The previous prime is 1191471961. The next prime is 1191471991. The reversal of 1191471973 is 3791741911.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1181090689 + 10381284 = 34367^2 + 3222^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191471973 - 2¹⁷ = 1191340901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1191471913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595735986 + 595735987.

It is an arithmetic number, because the mean of its divisors is an integer number (595735987).

Almost surely, 2^1191471973 is an apocalyptic number.

It is an amenable number.

1191471973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191471973 is an equidigital number, since it uses as much as digits as its factorization.

1191471973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47628, while the sum is 43.

The square root of 1191471973 is about 34517.7052105148. The cubic root of 1191471973 is about 1060.1352541900.

The spelling of 1191471973 in words is "one billion, one hundred ninety-one million, four hundred seventy-one thousand, nine hundred seventy-three".