1320200557 has 4 divisors (see below), whose sum is σ = 1421754460. Its totient is φ = 1218646656.

The previous prime is 1320200551. The next prime is 1320200587. The reversal of 1320200557 is 7550020231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7550020231 = 13 ⋅580770787.

It can be written as a sum of positive squares in 2 ways, for example, as 278589481 + 1041611076 = 16691^2 + 32274^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320200557 - 2³ = 1320200549 is a prime.

It is a super-2 number, since 2×1320200557² = 3485859021406220498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320200551) 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, 50776932 + ... + 50776957.

It is an arithmetic number, because the mean of its divisors is an integer number (355438615).

Almost surely, 2^1320200557 is an apocalyptic number.

It is an amenable number.

1320200557 is a deficient number, since it is larger than the sum of its proper divisors (101553903).

1320200557 is a wasteful number, since it uses less digits than its factorization.

1320200557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101553902.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 1320200557 is about 36334.5642192114. The cubic root of 1320200557 is about 1097.0168640543.

Adding to 1320200557 its reverse (7550020231), we get a palindrome (8870220788).

The spelling of 1320200557 in words is "one billion, three hundred twenty million, two hundred thousand, five hundred fifty-seven".