245445551 has 8 divisors (see below), whose sum is σ = 264451824. Its totient is φ = 226457280.

The previous prime is 245445533. The next prime is 245445559. The reversal of 245445551 is 155544542.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-245445551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (245445559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40691 + ... + 46331.

It is an arithmetic number, because the mean of its divisors is an integer number (33056478).

Almost surely, 2^245445551 is an apocalyptic number.

245445551 is a deficient number, since it is larger than the sum of its proper divisors (19006273).

245445551 is a wasteful number, since it uses less digits than its factorization.

245445551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9001.

The product of its digits is 80000, while the sum is 35.

The square root of 245445551 is about 15666.7019822297. The cubic root of 245445551 is about 626.1115587807. Note that the first 3 decimals are identical.

The spelling of 245445551 in words is "two hundred forty-five million, four hundred forty-five thousand, five hundred fifty-one".