1561273874 has 8 divisors (see below), whose sum is σ = 2345107980. Its totient is φ = 779571216.

The previous prime is 1561273853. The next prime is 1561273877. The reversal of 1561273874 is 4783721651.

It can be written as a sum of positive squares in 2 ways, for example, as 1560645025 + 628849 = 39505^2 + 793^2 .

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

It is a super-2 number, since 2×1561273874² = 4875152219269935752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1561273877) 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, 531029 + ... + 533960.

Almost surely, 2^1561273874 is an apocalyptic number.

1561273874 is a deficient number, since it is larger than the sum of its proper divisors (783834106).

1561273874 is a wasteful number, since it uses less digits than its factorization.

1561273874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065724.

The product of its digits is 282240, while the sum is 44.

The square root of 1561273874 is about 39512.9583048397. The cubic root of 1561273874 is about 1160.0935997600.

The spelling of 1561273874 in words is "one billion, five hundred sixty-one million, two hundred seventy-three thousand, eight hundred seventy-four".