1191983537 has 2 divisors, whose sum is σ = 1191983538. Its totient is φ = 1191983536.

The previous prime is 1191983489. The next prime is 1191983567. The reversal of 1191983537 is 7353891911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1185838096 + 6145441 = 34436^2 + 2479^2 .

It is a cyclic number.

It is not a de Polignac number, because 1191983537 - 2¹² = 1191979441 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1191983491 and 1191983500.

It is not a weakly prime, because it can be changed into another prime (1191983567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 595991768 + 595991769.

It is an arithmetic number, because the mean of its divisors is an integer number (595991769).

Almost surely, 2^1191983537 is an apocalyptic number.

It is an amenable number.

1191983537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1191983537 is an equidigital number, since it uses as much as digits as its factorization.

1191983537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 47.

The square root of 1191983537 is about 34525.1145834449. The cubic root of 1191983537 is about 1060.2869571381.

The spelling of 1191983537 in words is "one billion, one hundred ninety-one million, nine hundred eighty-three thousand, five hundred thirty-seven".