1534312561 has 4 divisors (see below), whose sum is σ = 1534475124. Its totient is φ = 1534150000.

The previous prime is 1534312553. The next prime is 1534312579. The reversal of 1534312561 is 1652134351.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 534488161 + 999824400 = 23119^2 + 31620^2 .

It is a cyclic number.

It is not a de Polignac number, because 1534312561 - 2³ = 1534312553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1534312511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66190 + ... + 86311.

It is an arithmetic number, because the mean of its divisors is an integer number (383618781).

Almost surely, 2^1534312561 is an apocalyptic number.

It is an amenable number.

1534312561 is a deficient number, since it is larger than the sum of its proper divisors (162563).

1534312561 is a wasteful number, since it uses less digits than its factorization.

1534312561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162562.

The product of its digits is 10800, while the sum is 31.

The square root of 1534312561 is about 39170.3020284501. The cubic root of 1534312561 is about 1153.3769826460.

The spelling of 1534312561 in words is "one billion, five hundred thirty-four million, three hundred twelve thousand, five hundred sixty-one".