1051810261 has 2 divisors, whose sum is σ = 1051810262. Its totient is φ = 1051810260.

The previous prime is 1051810241. The next prime is 1051810283. The reversal of 1051810261 is 1620181501.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 816187761 + 235622500 = 28569^2 + 15350^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051810261 - 2²¹ = 1049713109 is a prime.

It is a super-2 number, since 2×1051810261² = 2212609650289776242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1051810241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 525905130 + 525905131.

It is an arithmetic number, because the mean of its divisors is an integer number (525905131).

Almost surely, 2^1051810261 is an apocalyptic number.

It is an amenable number.

1051810261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1051810261 is an equidigital number, since it uses as much as digits as its factorization.

1051810261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 25.

The square root of 1051810261 is about 32431.6243965670. The cubic root of 1051810261 is about 1016.9801302458.

Adding to 1051810261 its reverse (1620181501), we get a palindrome (2671991762).

The spelling of 1051810261 in words is "one billion, fifty-one million, eight hundred ten thousand, two hundred sixty-one".