196091551 has 2 divisors, whose sum is σ = 196091552. Its totient is φ = 196091550.

The previous prime is 196091543. The next prime is 196091557. The reversal of 196091551 is 155190691.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 196091551 - 2³ = 196091543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 196091551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196091557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98045775 + 98045776.

It is an arithmetic number, because the mean of its divisors is an integer number (98045776).

Almost surely, 2^196091551 is an apocalyptic number.

196091551 is a deficient number, since it is larger than the sum of its proper divisors (1).

196091551 is an equidigital number, since it uses as much as digits as its factorization.

196091551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12150, while the sum is 37.

The square root of 196091551 is about 14003.2692968464. The cubic root of 196091551 is about 580.9690014794.

The spelling of 196091551 in words is "one hundred ninety-six million, ninety-one thousand, five hundred fifty-one".