1568468261 has 4 divisors (see below), whose sum is σ = 1568632332. Its totient is φ = 1568304192.

The previous prime is 1568468249. The next prime is 1568468287. The reversal of 1568468261 is 1628648651.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1628648651 = 7 ⋅232664093.

It can be written as a sum of positive squares in 2 ways, for example, as 876515236 + 691953025 = 29606^2 + 26305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1568468261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1568461261) 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, 66746 + ... + 87131.

It is an arithmetic number, because the mean of its divisors is an integer number (392158083).

Almost surely, 2^1568468261 is an apocalyptic number.

It is an amenable number.

1568468261 is a deficient number, since it is larger than the sum of its proper divisors (164071).

1568468261 is a wasteful number, since it uses less digits than its factorization.

1568468261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164070.

The product of its digits is 552960, while the sum is 47.

The square root of 1568468261 is about 39603.8919930857. The cubic root of 1568468261 is about 1161.8727826437.

The spelling of 1568468261 in words is "one billion, five hundred sixty-eight million, four hundred sixty-eight thousand, two hundred sixty-one".