1481187857 has 2 divisors, whose sum is σ = 1481187858. Its totient is φ = 1481187856.

The previous prime is 1481187821. The next prime is 1481187863. The reversal of 1481187857 is 7587811841.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1319796241 + 161391616 = 36329^2 + 12704^2 .

It is a cyclic number.

It is not a de Polignac number, because 1481187857 - 2⁶ = 1481187793 is a prime.

It is not a weakly prime, because it can be changed into another prime (1481187817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 740593928 + 740593929.

It is an arithmetic number, because the mean of its divisors is an integer number (740593929).

Almost surely, 2^1481187857 is an apocalyptic number.

It is an amenable number.

1481187857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1481187857 is an equidigital number, since it uses as much as digits as its factorization.

1481187857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 501760, while the sum is 50.

The square root of 1481187857 is about 38486.2034630593. The cubic root of 1481187857 is about 1139.9086458548.

The spelling of 1481187857 in words is "one billion, four hundred eighty-one million, one hundred eighty-seven thousand, eight hundred fifty-seven".