3781485397 has 2 divisors, whose sum is σ = 3781485398. Its totient is φ = 3781485396.

The previous prime is 3781485277. The next prime is 3781485401. The reversal of 3781485397 is 7935841873.

It is a happy number.

3781485397 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3344424561 + 437060836 = 57831^2 + 20906^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3781485397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3781483397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890742698 + 1890742699.

It is an arithmetic number, because the mean of its divisors is an integer number (1890742699).

Almost surely, 2^3781485397 is an apocalyptic number.

It is an amenable number.

3781485397 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781485397 is an equidigital number, since it uses as much as digits as its factorization.

3781485397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5080320, while the sum is 55.

The square root of 3781485397 is about 61493.7834012512. The cubic root of 3781485397 is about 1557.9522492084.

The spelling of 3781485397 in words is "three billion, seven hundred eighty-one million, four hundred eighty-five thousand, three hundred ninety-seven".