1561240532 has 12 divisors (see below), whose sum is σ = 2736211380. Its totient is φ = 779465856.

The previous prime is 1561240489. The next prime is 1561240537. The reversal of 1561240532 is 2350421651.

It can be written as a sum of positive squares in 2 ways, for example, as 1512743236 + 48497296 = 38894^2 + 6964^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1561240495 and 1561240504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561240537) 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, 285557 + ... + 290972.

It is an arithmetic number, because the mean of its divisors is an integer number (228017615).

Almost surely, 2^1561240532 is an apocalyptic number.

It is an amenable number.

1561240532 is a deficient number, since it is larger than the sum of its proper divisors (1174970848).

1561240532 is a wasteful number, since it uses less digits than its factorization.

1561240532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577210 (or 577208 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1561240532 is about 39512.5363903660. The cubic root of 1561240532 is about 1160.0853415215.

The spelling of 1561240532 in words is "one billion, five hundred sixty-one million, two hundred forty thousand, five hundred thirty-two".