196561787 has 2 divisors, whose sum is σ = 196561788. Its totient is φ = 196561786.

The previous prime is 196561741. The next prime is 196561817. The reversal of 196561787 is 787165691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 196561787 - 2¹⁴ = 196545403 is a prime.

It is a super-2 number, since 2×196561787² = 77273072217266738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (196561087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98280893 + 98280894.

It is an arithmetic number, because the mean of its divisors is an integer number (98280894).

Almost surely, 2^196561787 is an apocalyptic number.

196561787 is a deficient number, since it is larger than the sum of its proper divisors (1).

196561787 is an equidigital number, since it uses as much as digits as its factorization.

196561787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 635040, while the sum is 50.

The square root of 196561787 is about 14020.0494649627. The cubic root of 196561787 is about 581.4330270032.

The spelling of 196561787 in words is "one hundred ninety-six million, five hundred sixty-one thousand, seven hundred eighty-seven".