197253491 has 2 divisors, whose sum is σ = 197253492. Its totient is φ = 197253490.

The previous prime is 197253487. The next prime is 197253493. The reversal of 197253491 is 194352791.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 197253491 - 2² = 197253487 is a prime.

Together with 197253493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (197253493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98626745 + 98626746.

It is an arithmetic number, because the mean of its divisors is an integer number (98626746).

Almost surely, 2^197253491 is an apocalyptic number.

197253491 is a deficient number, since it is larger than the sum of its proper divisors (1).

197253491 is an equidigital number, since it uses as much as digits as its factorization.

197253491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 41.

The square root of 197253491 is about 14044.6961875293. The cubic root of 197253491 is about 582.1142525152.

The spelling of 197253491 in words is "one hundred ninety-seven million, two hundred fifty-three thousand, four hundred ninety-one".