1340520261 has 16 divisors (see below), whose sum is σ = 1893253824. Its totient is φ = 840775424.

The previous prime is 1340520241. The next prime is 1340520263. The reversal of 1340520261 is 1620250431.

It is a cyclic number.

It is not a de Polignac number, because 1340520261 - 2¹⁷ = 1340389189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340520263) 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 15 ways as a sum of consecutive naturals, for example, 208846 + ... + 215168.

It is an arithmetic number, because the mean of its divisors is an integer number (118328364).

Almost surely, 2^1340520261 is an apocalyptic number.

It is an amenable number.

1340520261 is a deficient number, since it is larger than the sum of its proper divisors (552733563).

1340520261 is a wasteful number, since it uses less digits than its factorization.

1340520261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 1340520261 is about 36613.1159695539. The cubic root of 1340520261 is about 1102.6164331144.

Adding to 1340520261 its reverse (1620250431), we get a palindrome (2960770692).

The spelling of 1340520261 in words is "one billion, three hundred forty million, five hundred twenty thousand, two hundred sixty-one".