7451919989 has 2 divisors, whose sum is σ = 7451919990. Its totient is φ = 7451919988.

The previous prime is 7451919967. The next prime is 7451920009. The reversal of 7451919989 is 9899191547.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7027971889 + 423948100 = 83833^2 + 20590^2 .

It is a cyclic number.

It is not a de Polignac number, because 7451919989 - 2⁸ = 7451919733 is a prime.

It is a super-2 number, since 2×7451919989² (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 (7451919089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3725959994 + 3725959995.

It is an arithmetic number, because the mean of its divisors is an integer number (3725959995).

Almost surely, 2^7451919989 is an apocalyptic number.

It is an amenable number.

7451919989 is a deficient number, since it is larger than the sum of its proper divisors (1).

7451919989 is an equidigital number, since it uses as much as digits as its factorization.

7451919989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7348320, while the sum is 62.

The square root of 7451919989 is about 86324.5039893077. The cubic root of 7451919989 is about 1953.2420308529.

The spelling of 7451919989 in words is "seven billion, four hundred fifty-one million, nine hundred nineteen thousand, nine hundred eighty-nine".