7721049031 has 2 divisors, whose sum is σ = 7721049032. Its totient is φ = 7721049030.

The previous prime is 7721048987. The next prime is 7721049067. The reversal of 7721049031 is 1309401277.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7721049031 - 2¹³ = 7721040839 is a prime.

It is a super-2 number, since 2×7721049031² (a number of 21 digits) contains 22 as substring.

It is the 87870-th Hogben number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7721049071) by changing a digit.

It is a nontrivial repunit in base 87869.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860524515 + 3860524516.

It is an arithmetic number, because the mean of its divisors is an integer number (3860524516).

Almost surely, 2^7721049031 is an apocalyptic number.

7721049031 is a deficient number, since it is larger than the sum of its proper divisors (1).

7721049031 is an equidigital number, since it uses as much as digits as its factorization.

7721049031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 7721049031 is about 87869.5000042677. The cubic root of 7721049031 is about 1976.4785408514.

The spelling of 7721049031 in words is "seven billion, seven hundred twenty-one million, forty-nine thousand, thirty-one".