11761621 has 4 divisors (see below), whose sum is σ = 11774752. Its totient is φ = 11748492.

The previous prime is 11761577. The next prime is 11761639. The reversal of 11761621 is 12616711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12616711 = 29 ⋅435059.

It is a cyclic number.

It is not a de Polignac number, because 11761621 - 2⁹ = 11761109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11761691) 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, 5115 + ... + 7048.

It is an arithmetic number, because the mean of its divisors is an integer number (2943688).

Almost surely, 2^11761621 is an apocalyptic number.

It is an amenable number.

11761621 is a deficient number, since it is larger than the sum of its proper divisors (13131).

11761621 is an equidigital number, since it uses as much as digits as its factorization.

11761621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13130.

The product of its digits is 504, while the sum is 25.

The square root of 11761621 is about 3429.5219783521. The cubic root of 11761621 is about 227.4167211186.

The spelling of 11761621 in words is "eleven million, seven hundred sixty-one thousand, six hundred twenty-one".