1321857049 has 8 divisors (see below), whose sum is σ = 1401002568. Its totient is φ = 1242865920.

The previous prime is 1321857041. The next prime is 1321857067. The reversal of 1321857049 is 9407581231.

It can be written as a sum of positive squares in 4 ways, for example, as 184009225 + 1137847824 = 13565^2 + 33732^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1321857049 - 2³ = 1321857041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1321857041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20722 + ... + 55435.

It is an arithmetic number, because the mean of its divisors is an integer number (175125321).

Almost surely, 2^1321857049 is an apocalyptic number.

It is an amenable number.

1321857049 is a deficient number, since it is larger than the sum of its proper divisors (79145519).

1321857049 is a wasteful number, since it uses less digits than its factorization.

1321857049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77195.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1321857049 is about 36357.3520625471. The cubic root of 1321857049 is about 1097.4754913814.

The spelling of 1321857049 in words is "one billion, three hundred twenty-one million, eight hundred fifty-seven thousand, forty-nine".