1535798881 has 2 divisors, whose sum is σ = 1535798882. Its totient is φ = 1535798880.

The previous prime is 1535798843. The next prime is 1535798909. The reversal of 1535798881 is 1888975351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1533427281 + 2371600 = 39159^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 1535798881 - 2¹¹ = 1535796833 is a prime.

It is a super-2 number, since 2×1535798881² = 4717356405761704322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1535798981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 767899440 + 767899441.

It is an arithmetic number, because the mean of its divisors is an integer number (767899441).

Almost surely, 2^1535798881 is an apocalyptic number.

It is an amenable number.

1535798881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1535798881 is an equidigital number, since it uses as much as digits as its factorization.

1535798881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2419200, while the sum is 55.

The square root of 1535798881 is about 39189.2699727872. The cubic root of 1535798881 is about 1153.7492957507.

The spelling of 1535798881 in words is "one billion, five hundred thirty-five million, seven hundred ninety-eight thousand, eight hundred eighty-one".