1187521 has 4 divisors (see below), whose sum is σ = 1228500. Its totient is φ = 1146544.

The previous prime is 1187509. The next prime is 1187539. The reversal of 1187521 is 1257811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1257811 = 139 ⋅9049.

It can be written as a sum of positive squares in 2 ways, for example, as 579121 + 608400 = 761^2 + 780^2 .

It is not a de Polignac number, because 1187521 - 2⁵ = 1187489 is a prime.

It is a super-2 number, since 2×1187521² = 2820412250882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1187551) 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, 20446 + ... + 20503.

It is an arithmetic number, because the mean of its divisors is an integer number (307125).

2^1187521 is an apocalyptic number.

It is an amenable number.

1187521 is a deficient number, since it is larger than the sum of its proper divisors (40979).

1187521 is an equidigital number, since it uses as much as digits as its factorization.

1187521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40978.

The product of its digits is 560, while the sum is 25.

The square root of 1187521 is about 1089.7343713034. The cubic root of 1187521 is about 105.8962138293.

The spelling of 1187521 in words is "one million, one hundred eighty-seven thousand, five hundred twenty-one".