7531988621 has 2 divisors, whose sum is σ = 7531988622. Its totient is φ = 7531988620.

The previous prime is 7531988543. The next prime is 7531988677. The reversal of 7531988621 is 1268891357.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6388804900 + 1143183721 = 79930^2 + 33811^2 .

It is a cyclic number.

It is not a de Polignac number, because 7531988621 - 2¹⁴ = 7531972237 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7531988621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7531988221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3765994310 + 3765994311.

It is an arithmetic number, because the mean of its divisors is an integer number (3765994311).

Almost surely, 2^7531988621 is an apocalyptic number.

It is an amenable number.

7531988621 is a deficient number, since it is larger than the sum of its proper divisors (1).

7531988621 is an equidigital number, since it uses as much as digits as its factorization.

7531988621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 7531988621 is about 86787.0302579827. The cubic root of 7531988621 is about 1960.2127893541.

The spelling of 7531988621 in words is "seven billion, five hundred thirty-one million, nine hundred eighty-eight thousand, six hundred twenty-one".