1491157258 has 4 divisors (see below), whose sum is σ = 2236735890. Its totient is φ = 745578628.

The previous prime is 1491157253. The next prime is 1491157267. The reversal of 1491157258 is 8527511941.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1214034649 + 277122609 = 34843^2 + 16647^2 .

It is not an unprimeable number, because it can be changed into a prime (1491157253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 372789313 + ... + 372789316.

Almost surely, 2^1491157258 is an apocalyptic number.

1491157258 is a deficient number, since it is larger than the sum of its proper divisors (745578632).

1491157258 is an equidigital number, since it uses as much as digits as its factorization.

1491157258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745578631.

The product of its digits is 100800, while the sum is 43.

The square root of 1491157258 is about 38615.5054090970. The cubic root of 1491157258 is about 1142.4603827315.

The spelling of 1491157258 in words is "one billion, four hundred ninety-one million, one hundred fifty-seven thousand, two hundred fifty-eight".