245131531 has 4 divisors (see below), whose sum is σ = 245334832. Its totient is φ = 244928232.

The previous prime is 245131529. The next prime is 245131541. The reversal of 245131531 is 135131542.

It is a happy number.

245131531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 245131531 - 2¹ = 245131529 is a prime.

It is a super-2 number, since 2×245131531² = 120178934980807922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 245131496 and 245131505.

It is not an unprimeable number, because it can be changed into a prime (245131541) 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, 99831 + ... + 102256.

It is an arithmetic number, because the mean of its divisors is an integer number (61333708).

Almost surely, 2^245131531 is an apocalyptic number.

245131531 is a deficient number, since it is larger than the sum of its proper divisors (203301).

245131531 is a wasteful number, since it uses less digits than its factorization.

245131531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203300.

The product of its digits is 1800, while the sum is 25.

The square root of 245131531 is about 15656.6768824039. The cubic root of 245131531 is about 625.8444317023.

The spelling of 245131531 in words is "two hundred forty-five million, one hundred thirty-one thousand, five hundred thirty-one".