249195071 has 2 divisors, whose sum is σ = 249195072. Its totient is φ = 249195070.

The previous prime is 249195047. The next prime is 249195073. The reversal of 249195071 is 170591942.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249195071 is a prime.

Together with 249195073, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (249195073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124597535 + 124597536.

It is an arithmetic number, because the mean of its divisors is an integer number (124597536).

Almost surely, 2^249195071 is an apocalyptic number.

249195071 is a deficient number, since it is larger than the sum of its proper divisors (1).

249195071 is an equidigital number, since it uses as much as digits as its factorization.

249195071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 249195071 is about 15785.9136891090. The cubic root of 249195071 is about 629.2837000384.

The spelling of 249195071 in words is "two hundred forty-nine million, one hundred ninety-five thousand, seventy-one".