1161621 has 10 divisors (see below), whose sum is σ = 1735382. Its totient is φ = 774360.

The previous prime is 1161619. The next prime is 1161637. The reversal of 1161621 is 1261611.

It can be written as a sum of positive squares in only one way, i.e., 656100 + 505521 = 810^2 + 711^2 .

It is not a de Polignac number, because 1161621 - 2¹ = 1161619 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 1161594 and 1161603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 7090 + ... + 7251.

2^1161621 is an apocalyptic number.

It is an amenable number.

1161621 is a deficient number, since it is larger than the sum of its proper divisors (573761).

1161621 is an equidigital number, since it uses as much as digits as its factorization.

1161621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14353 (or 14344 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1161621 is about 1077.7852290693. The cubic root of 1161621 is about 105.1206775774.

The spelling of 1161621 in words is "one million, one hundred sixty-one thousand, six hundred twenty-one".