245747531 has 2 divisors, whose sum is σ = 245747532. Its totient is φ = 245747530.

The previous prime is 245747521. The next prime is 245747533. The reversal of 245747531 is 135747542.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245747531 is a prime.

It is a super-2 number, since 2×245747531² = 120783697985191922, which contains 22 as substring.

Together with 245747533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (245747533) 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, 122873765 + 122873766.

It is an arithmetic number, because the mean of its divisors is an integer number (122873766).

Almost surely, 2^245747531 is an apocalyptic number.

245747531 is a deficient number, since it is larger than the sum of its proper divisors (1).

245747531 is an equidigital number, since it uses as much as digits as its factorization.

245747531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 117600, while the sum is 38.

The square root of 245747531 is about 15676.3366575230. The cubic root of 245747531 is about 626.3682289867.

The spelling of 245747531 in words is "two hundred forty-five million, seven hundred forty-seven thousand, five hundred thirty-one".