1561514239 has 2 divisors, whose sum is σ = 1561514240. Its totient is φ = 1561514238.

The previous prime is 1561514203. The next prime is 1561514287. The reversal of 1561514239 is 9324151651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561514239 - 2⁷ = 1561514111 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1561514198 and 1561514207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561514839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780757119 + 780757120.

It is an arithmetic number, because the mean of its divisors is an integer number (780757120).

Almost surely, 2^1561514239 is an apocalyptic number.

1561514239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561514239 is an equidigital number, since it uses as much as digits as its factorization.

1561514239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 37.

The square root of 1561514239 is about 39515.9997848973. Note that the first 3 decimals coincide. The cubic root of 1561514239 is about 1160.1531305475.

The spelling of 1561514239 in words is "one billion, five hundred sixty-one million, five hundred fourteen thousand, two hundred thirty-nine".