7155649 has 2 divisors, whose sum is σ = 7155650. Its totient is φ = 7155648.

The previous prime is 7155611. The next prime is 7155653. The reversal of 7155649 is 9465517.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4410000 + 2745649 = 2100^2 + 1657^2 .

It is an emirp because it is prime and its reverse (9465517) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7155649 - 2²¹ = 5058497 is a prime.

It is a super-2 number, since 2×7155649² = 102406625222402, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7155149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3577824 + 3577825.

It is an arithmetic number, because the mean of its divisors is an integer number (3577825).

Almost surely, 2^7155649 is an apocalyptic number.

It is an amenable number.

7155649 is a deficient number, since it is larger than the sum of its proper divisors (1).

7155649 is an equidigital number, since it uses as much as digits as its factorization.

7155649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 37800, while the sum is 37.

The square root of 7155649 is about 2675.0044859775. The cubic root of 7155649 is about 192.7005746578.

The spelling of 7155649 in words is "seven million, one hundred fifty-five thousand, six hundred forty-nine".