7534156921 has 2 divisors, whose sum is σ = 7534156922. Its totient is φ = 7534156920.

The previous prime is 7534156879. The next prime is 7534156939. The reversal of 7534156921 is 1296514357.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7488998521 + 45158400 = 86539^2 + 6720^2 .

It is an emirp because it is prime and its reverse (1296514357) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7534156921 is a prime.

It is not a weakly prime, because it can be changed into another prime (7534156121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3767078460 + 3767078461.

It is an arithmetic number, because the mean of its divisors is an integer number (3767078461).

Almost surely, 2^7534156921 is an apocalyptic number.

It is an amenable number.

7534156921 is a deficient number, since it is larger than the sum of its proper divisors (1).

7534156921 is an equidigital number, since it uses as much as digits as its factorization.

7534156921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 43.

The square root of 7534156921 is about 86799.5214330125. The cubic root of 7534156921 is about 1960.4008725554.

The spelling of 7534156921 in words is "seven billion, five hundred thirty-four million, one hundred fifty-six thousand, nine hundred twenty-one".