1117621 has 4 divisors (see below), whose sum is σ = 1119744. Its totient is φ = 1115500.

The previous prime is 1117609. The next prime is 1117657. The reversal of 1117621 is 1267111.

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: 1267111 = 97 ⋅13063.

It is a cyclic number.

It is not a de Polignac number, because 1117621 - 2¹¹ = 1115573 is a prime.

It is a Duffinian number.

1117621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1117601) 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, 396 + ... + 1546.

It is an arithmetic number, because the mean of its divisors is an integer number (279936).

2^1117621 is an apocalyptic number.

It is an amenable number.

1117621 is a deficient number, since it is larger than the sum of its proper divisors (2123).

1117621 is an equidigital number, since it uses as much as digits as its factorization.

1117621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2122.

The product of its digits is 84, while the sum is 19.

The square root of 1117621 is about 1057.1759550803. The cubic root of 1117621 is about 103.7763004886.

The spelling of 1117621 in words is "one million, one hundred seventeen thousand, six hundred twenty-one".