1261029799 has 2 divisors, whose sum is σ = 1261029800. Its totient is φ = 1261029798.

The previous prime is 1261029751. The next prime is 1261029851. The reversal of 1261029799 is 9979201621.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1261029799 - 2¹³ = 1261021607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1261029709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 630514899 + 630514900.

It is an arithmetic number, because the mean of its divisors is an integer number (630514900).

Almost surely, 2^1261029799 is an apocalyptic number.

1261029799 is a deficient number, since it is larger than the sum of its proper divisors (1).

1261029799 is an equidigital number, since it uses as much as digits as its factorization.

1261029799 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 1261029799 is about 35510.9813860445. The cubic root of 1261029799 is about 1080.3764688344.

The spelling of 1261029799 in words is "one billion, two hundred sixty-one million, twenty-nine thousand, seven hundred ninety-nine".