197432251 has 4 divisors (see below), whose sum is σ = 197544400. Its totient is φ = 197320104.

The previous prime is 197432233. The next prime is 197432267. The reversal of 197432251 is 152234791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 152234791 = 1559 ⋅97649.

It is a cyclic number.

It is not a de Polignac number, because 197432251 - 2⁵ = 197432219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197432201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53391 + ... + 56968.

It is an arithmetic number, because the mean of its divisors is an integer number (49386100).

Almost surely, 2^197432251 is an apocalyptic number.

197432251 is a deficient number, since it is larger than the sum of its proper divisors (112149).

197432251 is a wasteful number, since it uses less digits than its factorization.

197432251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112148.

The product of its digits is 15120, while the sum is 34.

The square root of 197432251 is about 14051.0587145596. The cubic root of 197432251 is about 582.2900454755.

It can be divided in two parts, 1974 and 32251, that added together give a square (34225 = 185²).

The spelling of 197432251 in words is "one hundred ninety-seven million, four hundred thirty-two thousand, two hundred fifty-one".