1958541491 has 4 divisors (see below), whose sum is σ = 2073749832. Its totient is φ = 1843333152.

The previous prime is 1958541439. The next prime is 1958541499. The reversal of 1958541491 is 1941458591.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1941458591 = 557 ⋅3485563.

It is a cyclic number.

It is not a de Polignac number, because 1958541491 - 2³⁰ = 884799667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1958541499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57604145 + ... + 57604178.

It is an arithmetic number, because the mean of its divisors is an integer number (518437458).

Almost surely, 2^1958541491 is an apocalyptic number.

1958541491 is a deficient number, since it is larger than the sum of its proper divisors (115208341).

1958541491 is a wasteful number, since it uses less digits than its factorization.

1958541491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115208340.

The product of its digits is 259200, while the sum is 47.

The square root of 1958541491 is about 44255.4119967265. The cubic root of 1958541491 is about 1251.1544515451.

The spelling of 1958541491 in words is "one billion, nine hundred fifty-eight million, five hundred forty-one thousand, four hundred ninety-one".