1615142561 has 8 divisors (see below), whose sum is σ = 1669182984. Its totient is φ = 1561799680.

The previous prime is 1615142539. The next prime is 1615142603. The reversal of 1615142561 is 1652415161.

It can be written as a sum of positive squares in 4 ways, for example, as 521848336 + 1093294225 = 22844^2 + 33065^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1615142561 - 2¹⁸ = 1614880417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1615142261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169676 + ... + 178941.

It is an arithmetic number, because the mean of its divisors is an integer number (208647873).

Almost surely, 2^1615142561 is an apocalyptic number.

It is an amenable number.

1615142561 is a deficient number, since it is larger than the sum of its proper divisors (54040423).

1615142561 is a wasteful number, since it uses less digits than its factorization.

1615142561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348771.

The product of its digits is 7200, while the sum is 32.

The square root of 1615142561 is about 40188.8362732737. The cubic root of 1615142561 is about 1173.2852757646.

The spelling of 1615142561 in words is "one billion, six hundred fifteen million, one hundred forty-two thousand, five hundred sixty-one".