7631751221 has 2 divisors, whose sum is σ = 7631751222. Its totient is φ = 7631751220.

The previous prime is 7631751167. The next prime is 7631751229. The reversal of 7631751221 is 1221571367.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7581184900 + 50566321 = 87070^2 + 7111^2 .

It is an emirp because it is prime and its reverse (1221571367) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7631751221 - 2²² = 7627556917 is a prime.

It is a super-3 number, since 3×7631751221³ (a number of 31 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7631751229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3815875610 + 3815875611.

It is an arithmetic number, because the mean of its divisors is an integer number (3815875611).

Almost surely, 2^7631751221 is an apocalyptic number.

It is an amenable number.

7631751221 is a deficient number, since it is larger than the sum of its proper divisors (1).

7631751221 is an equidigital number, since it uses as much as digits as its factorization.

7631751221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17640, while the sum is 35.

The square root of 7631751221 is about 87359.8948087737. The cubic root of 7631751221 is about 1968.8293199170.

The spelling of 7631751221 in words is "seven billion, six hundred thirty-one million, seven hundred fifty-one thousand, two hundred twenty-one".