7491943189 has 2 divisors, whose sum is σ = 7491943190. Its totient is φ = 7491943188.

The previous prime is 7491943183. The next prime is 7491943211. The reversal of 7491943189 is 9813491947.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5342879025 + 2149064164 = 73095^2 + 46358^2 .

It is a cyclic number.

It is not a de Polignac number, because 7491943189 - 2¹⁷ = 7491812117 is a prime.

It is a super-2 number, since 2×7491943189² (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 (7491943183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3745971594 + 3745971595.

It is an arithmetic number, because the mean of its divisors is an integer number (3745971595).

Almost surely, 2^7491943189 is an apocalyptic number.

It is an amenable number.

7491943189 is a deficient number, since it is larger than the sum of its proper divisors (1).

7491943189 is an equidigital number, since it uses as much as digits as its factorization.

7491943189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1959552, while the sum is 55.

The square root of 7491943189 is about 86556.0118593735. The cubic root of 7491943189 is about 1956.7326505897.

The spelling of 7491943189 in words is "seven billion, four hundred ninety-one million, nine hundred forty-three thousand, one hundred eighty-nine".