1561525426 has 16 divisors (see below), whose sum is σ = 2400628608. Its totient is φ = 761335200.

The previous prime is 1561525421. The next prime is 1561525439. The reversal of 1561525426 is 6245251651.

It is not an unprimeable number, because it can be changed into a prime (1561525421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225451 + ... + 232273.

It is an arithmetic number, because the mean of its divisors is an integer number (150039288).

Almost surely, 2^1561525426 is an apocalyptic number.

1561525426 is a deficient number, since it is larger than the sum of its proper divisors (839103182).

1561525426 is a wasteful number, since it uses less digits than its factorization.

1561525426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9657.

The product of its digits is 72000, while the sum is 37.

The square root of 1561525426 is about 39516.1413349026. The cubic root of 1561525426 is about 1160.1559010638.

It can be divided in two parts, 15615 and 25426, that added together give a triangular number (41041 = T₂₈₆).

The spelling of 1561525426 in words is "one billion, five hundred sixty-one million, five hundred twenty-five thousand, four hundred twenty-six".