1013256091 has 4 divisors (see below), whose sum is σ = 1013330592. Its totient is φ = 1013181592.

The previous prime is 1013256047. The next prime is 1013256103. The reversal of 1013256091 is 1906523101.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1906523101 = 7 ⋅272360443.

It is a cyclic number.

It is not a de Polignac number, because 1013256091 - 2⁷ = 1013255963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1013256791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10396 + ... + 46201.

It is an arithmetic number, because the mean of its divisors is an integer number (253332648).

Almost surely, 2^1013256091 is an apocalyptic number.

1013256091 is a deficient number, since it is larger than the sum of its proper divisors (74501).

1013256091 is an equidigital number, since it uses as much as digits as its factorization.

1013256091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74500.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 1013256091 is about 31831.6837600527. The cubic root of 1013256091 is about 1004.3993146492.

Adding to 1013256091 its reverse (1906523101), we get a palindrome (2919779192).

It can be divided in two parts, 101325 and 6091, that added together give a triangular number (107416 = T₄₆₃).

The spelling of 1013256091 in words is "one billion, thirteen million, two hundred fifty-six thousand, ninety-one".