1561648967 has 2 divisors, whose sum is σ = 1561648968. Its totient is φ = 1561648966.

The previous prime is 1561648939. The next prime is 1561648987. The reversal of 1561648967 is 7698461651.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561648967 is a prime.

It is a super-2 number, since 2×1561648967² = 4877494992264334178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561648937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780824483 + 780824484.

It is an arithmetic number, because the mean of its divisors is an integer number (780824484).

Almost surely, 2^1561648967 is an apocalyptic number.

1561648967 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561648967 is an equidigital number, since it uses as much as digits as its factorization.

1561648967 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 1561648967 is about 39517.7044753361. The cubic root of 1561648967 is about 1160.1864957285.

The spelling of 1561648967 in words is "one billion, five hundred sixty-one million, six hundred forty-eight thousand, nine hundred sixty-seven".