245243931971 has 2 divisors, whose sum is σ = 245243931972. Its totient is φ = 245243931970.

The previous prime is 245243931917. The next prime is 245243931991. The reversal of 245243931971 is 179139342542.

Together with previous prime (245243931917) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 245243931971 - 2²² = 245239737667 is a prime.

It is not a weakly prime, because it can be changed into another prime (245243931901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122621965985 + 122621965986.

It is an arithmetic number, because the mean of its divisors is an integer number (122621965986).

Almost surely, 2^245243931971 is an apocalyptic number.

245243931971 is a deficient number, since it is larger than the sum of its proper divisors (1).

245243931971 is an equidigital number, since it uses as much as digits as its factorization.

245243931971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1632960, while the sum is 50.

The spelling of 245243931971 in words is "two hundred forty-five billion, two hundred forty-three million, nine hundred thirty-one thousand, nine hundred seventy-one".