245120145531 has 4 divisors (see below), whose sum is σ = 326826860712. Its totient is φ = 163413430352.

The previous prime is 245120145521. The next prime is 245120145533. The reversal of 245120145531 is 135541021542.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 245120145531 - 2¹⁴ = 245120129147 is a prime.

It is a super-2 number, since 2×245120145531² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 245120145492 and 245120145501.

It is not an unprimeable number, because it can be changed into a prime (245120145533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40853357586 + ... + 40853357591.

It is an arithmetic number, because the mean of its divisors is an integer number (81706715178).

Almost surely, 2^245120145531 is an apocalyptic number.

245120145531 is a deficient number, since it is larger than the sum of its proper divisors (81706715181).

245120145531 is an equidigital number, since it uses as much as digits as its factorization.

245120145531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81706715180.

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 245120145531 in words is "two hundred forty-five billion, one hundred twenty million, one hundred forty-five thousand, five hundred thirty-one".