7499929981 has 2 divisors, whose sum is σ = 7499929982. Its totient is φ = 7499929980.

The previous prime is 7499929909. The next prime is 7499930003. The reversal of 7499929981 is 1899299947.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6932061081 + 567868900 = 83259^2 + 23830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7499929981 is a prime.

It is a super-2 number, since 2×7499929981² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7499929901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3749964990 + 3749964991.

It is an arithmetic number, because the mean of its divisors is an integer number (3749964991).

Almost surely, 2^7499929981 is an apocalyptic number.

It is an amenable number.

7499929981 is a deficient number, since it is larger than the sum of its proper divisors (1).

7499929981 is an equidigital number, since it uses as much as digits as its factorization.

7499929981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26453952, while the sum is 67.

The square root of 7499929981 is about 86602.1361226154. The cubic root of 7499929981 is about 1957.4277291184.

The spelling of 7499929981 in words is "seven billion, four hundred ninety-nine million, nine hundred twenty-nine thousand, nine hundred eighty-one".