245511551 has 4 divisors (see below), whose sum is σ = 245943600. Its totient is φ = 245079504.

The previous prime is 245511547. The next prime is 245511571. The reversal of 245511551 is 155115542.

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 245511551 - 2² = 245511547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245511571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215171 + ... + 216308.

It is an arithmetic number, because the mean of its divisors is an integer number (61485900).

Almost surely, 2^245511551 is an apocalyptic number.

245511551 is a deficient number, since it is larger than the sum of its proper divisors (432049).

245511551 is an equidigital number, since it uses as much as digits as its factorization.

245511551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432048.

The product of its digits is 5000, while the sum is 29.

The square root of 245511551 is about 15668.8082188787. The cubic root of 245511551 is about 626.1676739548.

The spelling of 245511551 in words is "two hundred forty-five million, five hundred eleven thousand, five hundred fifty-one".