7543720889 has 2 divisors, whose sum is σ = 7543720890. Its totient is φ = 7543720888.

The previous prime is 7543720837. The next prime is 7543720907. The reversal of 7543720889 is 9880273457.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6625146025 + 918574864 = 81395^2 + 30308^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7543720889 is a prime.

It is a super-2 number, since 2×7543720889² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7543720889.

It is not a weakly prime, because it can be changed into another prime (7543722889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3771860444 + 3771860445.

It is an arithmetic number, because the mean of its divisors is an integer number (3771860445).

Almost surely, 2^7543720889 is an apocalyptic number.

It is an amenable number.

7543720889 is a deficient number, since it is larger than the sum of its proper divisors (1).

7543720889 is an equidigital number, since it uses as much as digits as its factorization.

7543720889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3386880, while the sum is 53.

The square root of 7543720889 is about 86854.5962456795. The cubic root of 7543720889 is about 1961.2300422286.

The spelling of 7543720889 in words is "seven billion, five hundred forty-three million, seven hundred twenty thousand, eight hundred eighty-nine".