245123531 has 2 divisors, whose sum is σ = 245123532. Its totient is φ = 245123530.

The previous prime is 245123513. The next prime is 245123537. The reversal of 245123531 is 135321542.

It is a happy number.

Together with previous prime (245123513) 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 a de Polignac number, because none of the positive numbers 2^k-245123531 is a prime.

It is a super-2 number, since 2×245123531² = 120171090899815922, which contains 22 as substring.

It is a Chen prime.

It is equal to p_13427027 and since 245123531 and 13427027 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 245123531.

It is not a weakly prime, because it can be changed into another prime (245123537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122561765 + 122561766.

It is an arithmetic number, because the mean of its divisors is an integer number (122561766).

Almost surely, 2^245123531 is an apocalyptic number.

245123531 is a deficient number, since it is larger than the sum of its proper divisors (1).

245123531 is an equidigital number, since it uses as much as digits as its factorization.

245123531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3600, while the sum is 26.

The square root of 245123531 is about 15656.4213982634. The cubic root of 245123531 is about 625.8376233712.

The spelling of 245123531 in words is "two hundred forty-five million, one hundred twenty-three thousand, five hundred thirty-one".