3897131531 has 2 divisors, whose sum is σ = 3897131532. Its totient is φ = 3897131530.

The previous prime is 3897131519. The next prime is 3897131573. The reversal of 3897131531 is 1351317983.

It is a weak prime.

It is an emirp because it is prime and its reverse (1351317983) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3897131531 is a prime.

It is a super-2 number, since 2×3897131531² = 30375268339828807922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3897131501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1948565765 + 1948565766.

It is an arithmetic number, because the mean of its divisors is an integer number (1948565766).

Almost surely, 2^3897131531 is an apocalyptic number.

3897131531 is a deficient number, since it is larger than the sum of its proper divisors (1).

3897131531 is an equidigital number, since it uses as much as digits as its factorization.

3897131531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 3897131531 is about 62427.0096272439. The cubic root of 3897131531 is about 1573.6749121557.

The spelling of 3897131531 in words is "three billion, eight hundred ninety-seven million, one hundred thirty-one thousand, five hundred thirty-one".