1010405261 has 4 divisors (see below), whose sum is σ = 1011934524. Its totient is φ = 1008876000.

The previous prime is 1010405239. The next prime is 1010405293. The reversal of 1010405261 is 1625040101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1625040101 = 3109 ⋅522689.

It can be written as a sum of positive squares in 2 ways, for example, as 625500100 + 384905161 = 25010^2 + 19619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1010405261 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 (1010401261) 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, 763640 + ... + 764961.

It is an arithmetic number, because the mean of its divisors is an integer number (252983631).

Almost surely, 2^1010405261 is an apocalyptic number.

It is an amenable number.

1010405261 is a deficient number, since it is larger than the sum of its proper divisors (1529263).

1010405261 is an equidigital number, since it uses as much as digits as its factorization.

1010405261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1529262.

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 1010405261 is about 31786.8724633299. The cubic root of 1010405261 is about 1003.4564594565.

Adding to 1010405261 its reverse (1625040101), we get a palindrome (2635445362).

The spelling of 1010405261 in words is "one billion, ten million, four hundred five thousand, two hundred sixty-one".