1171001621 has 4 divisors (see below), whose sum is σ = 1171075500. Its totient is φ = 1170927744.

The previous prime is 1171001603. The next prime is 1171001627. The reversal of 1171001621 is 1261001711.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 941630596 + 229371025 = 30686^2 + 15145^2 .

It is a cyclic number.

It is not a de Polignac number, because 1171001621 - 2¹⁴ = 1170985237 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1171001593 and 1171001602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1171001627) 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, 2396 + ... + 48453.

It is an arithmetic number, because the mean of its divisors is an integer number (292768875).

Almost surely, 2^1171001621 is an apocalyptic number.

It is an amenable number.

1171001621 is a deficient number, since it is larger than the sum of its proper divisors (73879).

1171001621 is an equidigital number, since it uses as much as digits as its factorization.

1171001621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73878.

The product of its (nonzero) digits is 84, while the sum is 20.

The square root of 1171001621 is about 34219.9009495936. The cubic root of 1171001621 is about 1054.0288513767.

The spelling of 1171001621 in words is "one billion, one hundred seventy-one million, one thousand, six hundred twenty-one".