245551531 has 4 divisors (see below), whose sum is σ = 245956672. Its totient is φ = 245146392.

The previous prime is 245551517. The next prime is 245551541. The reversal of 245551531 is 135155542.

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 245551531 - 2²³ = 237162923 is a prime.

It is a super-2 number, since 2×245551531² = 120591108752887922, 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 = 245551493 and 245551502.

It is not an unprimeable number, because it can be changed into a prime (245551511) 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, 201660 + ... + 202873.

It is an arithmetic number, because the mean of its divisors is an integer number (61489168).

Almost surely, 2^245551531 is an apocalyptic number.

245551531 is a deficient number, since it is larger than the sum of its proper divisors (405141).

245551531 is an equidigital number, since it uses as much as digits as its factorization.

245551531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405140.

The product of its digits is 15000, while the sum is 31.

The square root of 245551531 is about 15670.0839499985. The cubic root of 245551531 is about 626.2016612557.

It can be divided in two parts, 24 and 5551531, that added together give a palindrome (5551555).

The spelling of 245551531 in words is "two hundred forty-five million, five hundred fifty-one thousand, five hundred thirty-one".