1561217053 has 8 divisors (see below), whose sum is σ = 1703440800. Its totient is φ = 1419042480.

The previous prime is 1561217051. The next prime is 1561217087. The reversal of 1561217053 is 3507121651.

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 1561217053 - 2¹ = 1561217051 is a prime.

It is a super-3 number, since 3×1561217053³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561217051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94398 + ... + 109696.

It is an arithmetic number, because the mean of its divisors is an integer number (212930100).

Almost surely, 2^1561217053 is an apocalyptic number.

It is an amenable number.

1561217053 is a deficient number, since it is larger than the sum of its proper divisors (142223747).

1561217053 is a wasteful number, since it uses less digits than its factorization.

1561217053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24587.

The product of its (nonzero) digits is 6300, while the sum is 31.

The square root of 1561217053 is about 39512.2392810127. The cubic root of 1561217053 is about 1160.0795261075.

The spelling of 1561217053 in words is "one billion, five hundred sixty-one million, two hundred seventeen thousand, fifty-three".