11721625 has 16 divisors (see below), whose sum is σ = 14826240. Its totient is φ = 9250800.

The previous prime is 11721623. The next prime is 11721629. The reversal of 11721625 is 52612711.

It is not a de Polignac number, because 11721625 - 2¹ = 11721623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a self number, because there is not a number n which added to its sum of digits gives 11721625.

It is not an unprimeable number, because it can be changed into a prime (11721623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9282 + ... + 10468.

It is an arithmetic number, because the mean of its divisors is an integer number (926640).

Almost surely, 2^11721625 is an apocalyptic number.

It is an amenable number.

11721625 is a deficient number, since it is larger than the sum of its proper divisors (3104615).

11721625 is an equidigital number, since it uses as much as digits as its factorization.

11721625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281 (or 1271 counting only the distinct ones).

The product of its digits is 840, while the sum is 25.

The square root of 11721625 is about 3423.6858792827. The cubic root of 11721625 is about 227.1586475957.

It can be divided in two parts, 117 and 21625, that multiplied together give a triangular number (2530125 = T₂₂₄₉).

The spelling of 11721625 in words is "eleven million, seven hundred twenty-one thousand, six hundred twenty-five".