1561242471 has 8 divisors (see below), whose sum is σ = 2081840640. Its totient is φ = 1040736312.

The previous prime is 1561242467. The next prime is 1561242493. The reversal of 1561242471 is 1742421651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561242471 - 2² = 1561242467 is a prime.

It is a super-3 number, since 3×1561242471³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561242421) 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, 47220 + ... + 73158.

It is an arithmetic number, because the mean of its divisors is an integer number (260230080).

Almost surely, 2^1561242471 is an apocalyptic number.

1561242471 is a deficient number, since it is larger than the sum of its proper divisors (520598169).

1561242471 is a wasteful number, since it uses less digits than its factorization.

1561242471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46005.

The product of its digits is 13440, while the sum is 33.

The square root of 1561242471 is about 39512.5609268749. The cubic root of 1561242471 is about 1160.0858217816.

The spelling of 1561242471 in words is "one billion, five hundred sixty-one million, two hundred forty-two thousand, four hundred seventy-one".