1561742452 has 24 divisors (see below), whose sum is σ = 2859078600. Its totient is φ = 745468416.

The previous prime is 1561742437. The next prime is 1561742473. The reversal of 1561742452 is 2542471651.

It can be written as a sum of positive squares in 4 ways, for example, as 443776356 + 1117966096 = 21066^2 + 33436^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65313 + ... + 85960.

It is an arithmetic number, because the mean of its divisors is an integer number (119128275).

Almost surely, 2^1561742452 is an apocalyptic number.

It is an amenable number.

1561742452 is a deficient number, since it is larger than the sum of its proper divisors (1297336148).

1561742452 is a wasteful number, since it uses less digits than its factorization.

1561742452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151395 (or 151393 counting only the distinct ones).

The product of its digits is 67200, while the sum is 37.

The square root of 1561742452 is about 39518.8872819061. The cubic root of 1561742452 is about 1160.2096460166.

The spelling of 1561742452 in words is "one billion, five hundred sixty-one million, seven hundred forty-two thousand, four hundred fifty-two".