1561247 has 2 divisors, whose sum is σ = 1561248. Its totient is φ = 1561246.

The previous prime is 1561243. The next prime is 1561267. The reversal of 1561247 is 7421651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561247 - 2² = 1561243 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780623 + 780624.

It is an arithmetic number, because the mean of its divisors is an integer number (780624).

2^1561247 is an apocalyptic number.

1561247 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561247 is an equidigital number, since it uses as much as digits as its factorization.

1561247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 1561247 is about 1249.4986994791. The cubic root of 1561247 is about 116.0086943543.

Adding to 1561247 its reverse (7421651), we get a palindrome (8982898).

The spelling of 1561247 in words is "one million, five hundred sixty-one thousand, two hundred forty-seven".