7631621 has 4 divisors (see below), whose sum is σ = 7639212. Its totient is φ = 7624032.

The previous prime is 7631609. The next prime is 7631633. The reversal of 7631621 is 1261367.

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 is an interprime number because it is at equal distance from previous prime (7631609) and next prime (7631633).

It can be written as a sum of positive squares in 2 ways, for example, as 1406596 + 6225025 = 1186^2 + 2495^2 .

It is a cyclic number.

It is not a de Polignac number, because 7631621 - 2¹⁸ = 7369477 is a prime.

It is a super-3 number, since 3×7631621³ (a number of 22 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7631641) 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 3 ways as a sum of consecutive naturals, for example, 2006 + ... + 4391.

It is an arithmetic number, because the mean of its divisors is an integer number (1909803).

Almost surely, 2^7631621 is an apocalyptic number.

It is an amenable number.

7631621 is a deficient number, since it is larger than the sum of its proper divisors (7591).

7631621 is a wasteful number, since it uses less digits than its factorization.

7631621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7590.

The product of its digits is 1512, while the sum is 26.

The square root of 7631621 is about 2762.5388685048. The cubic root of 7631621 is about 196.8818121772.

Adding to 7631621 its reverse (1261367), we get a palindrome (8892988).

The spelling of 7631621 in words is "seven million, six hundred thirty-one thousand, six hundred twenty-one".