1191260247 has 4 divisors (see below), whose sum is σ = 1588347000. Its totient is φ = 794173496.

The previous prime is 1191260243. The next prime is 1191260249. The reversal of 1191260247 is 7420621911.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7420621911 = 3 ⋅2473540637.

It is a cyclic number.

It is not a de Polignac number, because 1191260247 - 2² = 1191260243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1191260243) 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, 198543372 + ... + 198543377.

It is an arithmetic number, because the mean of its divisors is an integer number (397086750).

Almost surely, 2^1191260247 is an apocalyptic number.

1191260247 is a deficient number, since it is larger than the sum of its proper divisors (397086753).

1191260247 is an equidigital number, since it uses as much as digits as its factorization.

1191260247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397086752.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1191260247 is about 34514.6381554262. The cubic root of 1191260247 is about 1060.0724547009.

The spelling of 1191260247 in words is "one billion, one hundred ninety-one million, two hundred sixty thousand, two hundred forty-seven".