1191938971 has 2 divisors, whose sum is σ = 1191938972. Its totient is φ = 1191938970.

The previous prime is 1191938927. The next prime is 1191938977. The reversal of 1191938971 is 1798391911.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1191938971 - 2⁷ = 1191938843 is a prime.

It is not a weakly prime, because it can be changed into another prime (1191938977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595969485 + 595969486.

It is an arithmetic number, because the mean of its divisors is an integer number (595969486).

Almost surely, 2^1191938971 is an apocalyptic number.

1191938971 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191938971 is an equidigital number, since it uses as much as digits as its factorization.

1191938971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 49.

The square root of 1191938971 is about 34524.4691631892. The cubic root of 1191938971 is about 1060.2737429351.

It can be divided in two parts, 119193 and 8971, that added together give a square (128164 = 358²).

The spelling of 1191938971 in words is "one billion, one hundred ninety-one million, nine hundred thirty-eight thousand, nine hundred seventy-one".