1561431 has 8 divisors (see below), whose sum is σ = 2090880. Its totient is φ = 1036472.

The previous prime is 1561429. The next prime is 1561453. The reversal of 1561431 is 1341651.

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 1561431 - 2¹ = 1561429 is a prime.

It is a super-2 number, since 2×1561431² = 4876133535522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1561398 and 1561407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561421) 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, 201 + ... + 1778.

It is an arithmetic number, because the mean of its divisors is an integer number (261360).

2^1561431 is an apocalyptic number.

1561431 is a deficient number, since it is larger than the sum of its proper divisors (529449).

1561431 is a wasteful number, since it uses less digits than its factorization.

1561431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245.

The product of its digits is 360, while the sum is 21.

The square root of 1561431 is about 1249.5723268383. The cubic root of 1561431 is about 116.0132515579.

The spelling of 1561431 in words is "one million, five hundred sixty-one thousand, four hundred thirty-one".