1191251 has 4 divisors (see below), whose sum is σ = 1195032. Its totient is φ = 1187472.

The previous prime is 1191247. The next prime is 1191277. The reversal of 1191251 is 1521911.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1521911 = 139 ⋅10949.

It is a cyclic number.

It is not a de Polignac number, because 1191251 - 2² = 1191247 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1191221) 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, 1370 + ... + 2063.

It is an arithmetic number, because the mean of its divisors is an integer number (298758).

2^1191251 is an apocalyptic number.

1191251 is a deficient number, since it is larger than the sum of its proper divisors (3781).

1191251 is an equidigital number, since it uses as much as digits as its factorization.

1191251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3780.

The product of its digits is 90, while the sum is 20.

The square root of 1191251 is about 1091.4444557558. Note that the first 4 decimals coincide. The cubic root of 1191251 is about 106.0069711803.

The spelling of 1191251 in words is "one million, one hundred ninety-one thousand, two hundred fifty-one".