1561363387 has 2 divisors, whose sum is σ = 1561363388. Its totient is φ = 1561363386.

The previous prime is 1561363373. The next prime is 1561363417. The reversal of 1561363387 is 7833631651.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561363387 - 2¹⁹ = 1560839099 is a prime.

It is a super-2 number, since 2×1561363387² = 4875711252528223538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1561363987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780681693 + 780681694.

It is an arithmetic number, because the mean of its divisors is an integer number (780681694).

Almost surely, 2^1561363387 is an apocalyptic number.

1561363387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561363387 is an equidigital number, since it uses as much as digits as its factorization.

1561363387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 1561363387 is about 39514.0909929610. The cubic root of 1561363387 is about 1160.1157700052.

The spelling of 1561363387 in words is "one billion, five hundred sixty-one million, three hundred sixty-three thousand, three hundred eighty-seven".