1026706561 has 4 divisors (see below), whose sum is σ = 1028438532. Its totient is φ = 1024974592.

The previous prime is 1026706523. The next prime is 1026706579. The reversal of 1026706561 is 1656076201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1656076201 = 13 ⋅127390477.

It can be written as a sum of positive squares in 2 ways, for example, as 486423025 + 540283536 = 22055^2 + 23244^2 .

It is a cyclic number.

It is not a de Polignac number, because 1026706561 - 2¹⁷ = 1026575489 is a prime.

It is a super-4 number, since 4×1026706561⁴ (a number of 37 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1026700561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 865096 + ... + 866281.

It is an arithmetic number, because the mean of its divisors is an integer number (257109633).

Almost surely, 2^1026706561 is an apocalyptic number.

It is an amenable number.

1026706561 is a deficient number, since it is larger than the sum of its proper divisors (1731971).

1026706561 is an equidigital number, since it uses as much as digits as its factorization.

1026706561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1731970.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 1026706561 is about 32042.2621080348. The cubic root of 1026706561 is about 1008.8240933483.

The spelling of 1026706561 in words is "one billion, twenty-six million, seven hundred six thousand, five hundred sixty-one".