3897815081 has 2 divisors, whose sum is σ = 3897815082. Its totient is φ = 3897815080.

The previous prime is 3897815017. The next prime is 3897815087. The reversal of 3897815081 is 1805187983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3619225600 + 278589481 = 60160^2 + 16691^2 .

It is an emirp because it is prime and its reverse (1805187983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3897815081 - 2⁶ = 3897815017 is a prime.

It is a super-2 number, since 2×3897815081² = 30385924811342073122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3897815087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1948907540 + 1948907541.

It is an arithmetic number, because the mean of its divisors is an integer number (1948907541).

Almost surely, 2^3897815081 is an apocalyptic number.

It is an amenable number.

3897815081 is a deficient number, since it is larger than the sum of its proper divisors (1).

3897815081 is an equidigital number, since it uses as much as digits as its factorization.

3897815081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 483840, while the sum is 50.

The square root of 3897815081 is about 62432.4841809134. The cubic root of 3897815081 is about 1573.7669133787.

The spelling of 3897815081 in words is "three billion, eight hundred ninety-seven million, eight hundred fifteen thousand, eighty-one".