1261247701 has 24 divisors (see below), whose sum is σ = 1488011904. Its totient is φ = 1068925200.

The previous prime is 1261247633. The next prime is 1261247723. The reversal of 1261247701 is 1077421621.

It is not a de Polignac number, because 1261247701 - 2²³ = 1252859093 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 (1261247761) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1697136 + ... + 1697878.

It is an arithmetic number, because the mean of its divisors is an integer number (62000496).

Almost surely, 2^1261247701 is an apocalyptic number.

It is an amenable number.

1261247701 is a deficient number, since it is larger than the sum of its proper divisors (226764203).

1261247701 is an frugal number, since it uses more digits than its factorization.

1261247701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879 (or 851 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 1261247701 is about 35514.0493467022. The cubic root of 1261247701 is about 1080.4386938072.

The spelling of 1261247701 in words is "one billion, two hundred sixty-one million, two hundred forty-seven thousand, seven hundred one".