7535631721 has 2 divisors, whose sum is σ = 7535631722. Its totient is φ = 7535631720.

The previous prime is 7535631713. The next prime is 7535631731. The reversal of 7535631721 is 1271365357.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6125253696 + 1410378025 = 78264^2 + 37555^2 .

It is a cyclic number.

It is not a de Polignac number, because 7535631721 - 2³ = 7535631713 is a prime.

It is not a weakly prime, because it can be changed into another prime (7535631731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3767815860 + 3767815861.

It is an arithmetic number, because the mean of its divisors is an integer number (3767815861).

Almost surely, 2^7535631721 is an apocalyptic number.

It is an amenable number.

7535631721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7535631721 is an equidigital number, since it uses as much as digits as its factorization.

7535631721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132300, while the sum is 40.

The square root of 7535631721 is about 86808.0164558550. The cubic root of 7535631721 is about 1960.5287793939.

The spelling of 7535631721 in words is "seven billion, five hundred thirty-five million, six hundred thirty-one thousand, seven hundred twenty-one".