194971951 has 2 divisors, whose sum is σ = 194971952. Its totient is φ = 194971950.

The previous prime is 194971879. The next prime is 194971957. The reversal of 194971951 is 159179491.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 194971951 - 2²⁷ = 60754223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194971957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97485975 + 97485976.

It is an arithmetic number, because the mean of its divisors is an integer number (97485976).

Almost surely, 2^194971951 is an apocalyptic number.

194971951 is a deficient number, since it is larger than the sum of its proper divisors (1).

194971951 is an equidigital number, since it uses as much as digits as its factorization.

194971951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102060, while the sum is 46.

The square root of 194971951 is about 13963.2356923458. The cubic root of 194971951 is about 579.8611944888.

The spelling of 194971951 in words is "one hundred ninety-four million, nine hundred seventy-one thousand, nine hundred fifty-one".