7991653 has 2 divisors, whose sum is σ = 7991654. Its totient is φ = 7991652.

The previous prime is 7991639. The next prime is 7991657. The reversal of 7991653 is 3561997.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4464769 + 3526884 = 2113^2 + 1878^2 .

It is an emirp because it is prime and its reverse (3561997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7991653 - 2¹⁷ = 7860581 is a prime.

It is a super-4 number, since 4×7991653⁴ (a number of 29 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7991657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995826 + 3995827.

It is an arithmetic number, because the mean of its divisors is an integer number (3995827).

Almost surely, 2^7991653 is an apocalyptic number.

It is an amenable number.

7991653 is a deficient number, since it is larger than the sum of its proper divisors (1).

7991653 is an equidigital number, since it uses as much as digits as its factorization.

7991653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51030, while the sum is 40.

The square root of 7991653 is about 2826.9511845803. The cubic root of 7991653 is about 199.9304174608.

The spelling of 7991653 in words is "seven million, nine hundred ninety-one thousand, six hundred fifty-three".