1534871561 has 2 divisors, whose sum is σ = 1534871562. Its totient is φ = 1534871560.

The previous prime is 1534871549. The next prime is 1534871563. The reversal of 1534871561 is 1651784351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1314497536 + 220374025 = 36256^2 + 14845^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1534871561 is a prime.

Together with 1534871563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1534871563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 767435780 + 767435781.

It is an arithmetic number, because the mean of its divisors is an integer number (767435781).

Almost surely, 2^1534871561 is an apocalyptic number.

It is an amenable number.

1534871561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1534871561 is an equidigital number, since it uses as much as digits as its factorization.

1534871561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 1534871561 is about 39177.4368865550. The cubic root of 1534871561 is about 1153.5170365625.

The spelling of 1534871561 in words is "one billion, five hundred thirty-four million, eight hundred seventy-one thousand, five hundred sixty-one".