1023781261 has 2 divisors, whose sum is σ = 1023781262. Its totient is φ = 1023781260.

The previous prime is 1023781247. The next prime is 1023781277. The reversal of 1023781261 is 1621873201.

1023781261 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 737122500 + 286658761 = 27150^2 + 16931^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023781261 - 2¹¹ = 1023779213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1023782261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 511890630 + 511890631.

It is an arithmetic number, because the mean of its divisors is an integer number (511890631).

Almost surely, 2^1023781261 is an apocalyptic number.

It is an amenable number.

1023781261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1023781261 is an equidigital number, since it uses as much as digits as its factorization.

1023781261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 1023781261 is about 31996.5820205846. The cubic root of 1023781261 is about 1007.8650655679.

The spelling of 1023781261 in words is "one billion, twenty-three million, seven hundred eighty-one thousand, two hundred sixty-one".