1291700257 has 4 divisors (see below), whose sum is σ = 1292535700. Its totient is φ = 1290864816.

The previous prime is 1291700243. The next prime is 1291700269. The reversal of 1291700257 is 7520071921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1000520161 + 291180096 = 31631^2 + 17064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1291700257 - 2⁷ = 1291700129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1291700297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415398 + ... + 418495.

It is an arithmetic number, because the mean of its divisors is an integer number (323133925).

Almost surely, 2^1291700257 is an apocalyptic number.

It is an amenable number.

1291700257 is a deficient number, since it is larger than the sum of its proper divisors (835443).

1291700257 is an equidigital number, since it uses as much as digits as its factorization.

1291700257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 835442.

The product of its (nonzero) digits is 8820, while the sum is 34.

The square root of 1291700257 is about 35940.2317326976. The cubic root of 1291700257 is about 1089.0652865508.

The spelling of 1291700257 in words is "one billion, two hundred ninety-one million, seven hundred thousand, two hundred fifty-seven".