9958189421 has 2 divisors, whose sum is σ = 9958189422. Its totient is φ = 9958189420.

The previous prime is 9958189387. The next prime is 9958189463. The reversal of 9958189421 is 1249818599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9758673796 + 199515625 = 98786^2 + 14125^2 .

It is a cyclic number.

It is not a de Polignac number, because 9958189421 - 2³⁰ = 8884447597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9958189471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4979094710 + 4979094711.

It is an arithmetic number, because the mean of its divisors is an integer number (4979094711).

Almost surely, 2^9958189421 is an apocalyptic number.

It is an amenable number.

9958189421 is a deficient number, since it is larger than the sum of its proper divisors (1).

9958189421 is an equidigital number, since it uses as much as digits as its factorization.

9958189421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 56.

The square root of 9958189421 is about 99790.7281314251. The cubic root of 9958189421 is about 2151.4278902019.

The spelling of 9958189421 in words is "nine billion, nine hundred fifty-eight million, one hundred eighty-nine thousand, four hundred twenty-one".