1210016261 has 2 divisors, whose sum is σ = 1210016262. Its totient is φ = 1210016260.

The previous prime is 1210016257. The next prime is 1210016287. The reversal of 1210016261 is 1626100121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 810256225 + 399760036 = 28465^2 + 19994^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210016261 - 2² = 1210016257 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210016201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605008130 + 605008131.

It is an arithmetic number, because the mean of its divisors is an integer number (605008131).

Almost surely, 2^1210016261 is an apocalyptic number.

It is an amenable number.

1210016261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210016261 is an equidigital number, since it uses as much as digits as its factorization.

1210016261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 1210016261 is about 34785.2879965079. The cubic root of 1210016261 is about 1065.6070102323.

Adding to 1210016261 its reverse (1626100121), we get a palindrome (2836116382).

The spelling of 1210016261 in words is "one billion, two hundred ten million, sixteen thousand, two hundred sixty-one".