1958530991 has 2 divisors, whose sum is σ = 1958530992. Its totient is φ = 1958530990.

The previous prime is 1958530969. The next prime is 1958531011. The reversal of 1958530991 is 1990358591.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1958530991 - 2²² = 1954336687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1958530391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979265495 + 979265496.

It is an arithmetic number, because the mean of its divisors is an integer number (979265496).

Almost surely, 2^1958530991 is an apocalyptic number.

1958530991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1958530991 is an equidigital number, since it uses as much as digits as its factorization.

1958530991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437400, while the sum is 50.

The square root of 1958530991 is about 44255.2933670087. The cubic root of 1958530991 is about 1251.1522156729.

The spelling of 1958530991 in words is "one billion, nine hundred fifty-eight million, five hundred thirty thousand, nine hundred ninety-one".