245315531 has 4 divisors (see below), whose sum is σ = 245508912. Its totient is φ = 245122152.

The previous prime is 245315519. The next prime is 245315533. The reversal of 245315531 is 135513542.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245315531 is a prime.

It is a super-2 number, since 2×245315531² = 120359419499623922, 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 = 245315494 and 245315503.

It is not an unprimeable number, because it can be changed into a prime (245315533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94775 + ... + 97328.

It is an arithmetic number, because the mean of its divisors is an integer number (61377228).

Almost surely, 2^245315531 is an apocalyptic number.

245315531 is a deficient number, since it is larger than the sum of its proper divisors (193381).

245315531 is a wasteful number, since it uses less digits than its factorization.

245315531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193380.

The product of its digits is 9000, while the sum is 29.

The square root of 245315531 is about 15662.5518674321. The cubic root of 245315531 is about 626.0009824521. Note that the first 3 decimals are identical.

The spelling of 245315531 in words is "two hundred forty-five million, three hundred fifteen thousand, five hundred thirty-one".