11521953 has 8 divisors (see below), whose sum is σ = 17069600. Its totient is φ = 7681284.

The previous prime is 11521949. The next prime is 11521957. The reversal of 11521953 is 35912511.

It is an interprime number because it is at equal distance from previous prime (11521949) and next prime (11521957).

It is not a de Polignac number, because 11521953 - 2² = 11521949 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 426739 = 11521953 / (1 + 1 + 5 + 2 + 1 + 9 + 5 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11521957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 213343 + ... + 213396.

It is an arithmetic number, because the mean of its divisors is an integer number (2133700).

Almost surely, 2^11521953 is an apocalyptic number.

It is an amenable number.

11521953 is a deficient number, since it is larger than the sum of its proper divisors (5547647).

11521953 is an equidigital number, since it uses as much as digits as its factorization.

11521953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426748 (or 426742 counting only the distinct ones).

The product of its digits is 1350, while the sum is 27.

The square root of 11521953 is about 3394.4002415743. The cubic root of 11521953 is about 225.8614090114.

The spelling of 11521953 in words is "eleven million, five hundred twenty-one thousand, nine hundred fifty-three".