197929091 has 2 divisors, whose sum is σ = 197929092. Its totient is φ = 197929090.

The previous prime is 197929033. The next prime is 197929103. The reversal of 197929091 is 190929791.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197929091 - 2¹⁸ = 197666947 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197923091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98964545 + 98964546.

It is an arithmetic number, because the mean of its divisors is an integer number (98964546).

Almost surely, 2^197929091 is an apocalyptic number.

197929091 is a deficient number, since it is larger than the sum of its proper divisors (1).

197929091 is an equidigital number, since it uses as much as digits as its factorization.

197929091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 91854, while the sum is 47.

The square root of 197929091 is about 14068.7274122431. The cubic root of 197929091 is about 582.7780823319.

The spelling of 197929091 in words is "one hundred ninety-seven million, nine hundred twenty-nine thousand, ninety-one".