397693151 has 2 divisors, whose sum is σ = 397693152. Its totient is φ = 397693150.

The previous prime is 397693117. The next prime is 397693157. The reversal of 397693151 is 151396793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397693151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397693157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198846575 + 198846576.

It is an arithmetic number, because the mean of its divisors is an integer number (198846576).

Almost surely, 2^397693151 is an apocalyptic number.

397693151 is a deficient number, since it is larger than the sum of its proper divisors (1).

397693151 is an equidigital number, since it uses as much as digits as its factorization.

397693151 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 44.

The square root of 397693151 is about 19942.2453851115. The cubic root of 397693151 is about 735.3871506897.

The spelling of 397693151 in words is "three hundred ninety-seven million, six hundred ninety-three thousand, one hundred fifty-one".