1561550713 has 8 divisors (see below), whose sum is σ = 1599912000. Its totient is φ = 1523519088.

The previous prime is 1561550689. The next prime is 1561550737. The reversal of 1561550713 is 3170551651.

It is an interprime number because it is at equal distance from previous prime (1561550689) and next prime (1561550737).

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 1561550713 - 2¹⁷ = 1561419641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561550743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72813 + ... + 91786.

It is an arithmetic number, because the mean of its divisors is an integer number (199989000).

Almost surely, 2^1561550713 is an apocalyptic number.

It is an amenable number.

1561550713 is a deficient number, since it is larger than the sum of its proper divisors (38361287).

1561550713 is a wasteful number, since it uses less digits than its factorization.

1561550713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164831.

The product of its (nonzero) digits is 15750, while the sum is 34.

The square root of 1561550713 is about 39516.4612914669. The cubic root of 1561550713 is about 1160.1621634667.

The spelling of 1561550713 in words is "one billion, five hundred sixty-one million, five hundred fifty thousand, seven hundred thirteen".