245020251 has 8 divisors (see below), whose sum is σ = 373364224. Its totient is φ = 140011560.

The previous prime is 245020247. The next prime is 245020267. The reversal of 245020251 is 152020542.

It is a happy number.

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

It is not a de Polignac number, because 245020251 - 2² = 245020247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 11667631 = 245020251 / (2 + 4 + 5 + 0 + 2 + 0 + 2 + 5 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245020271) 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 7 ways as a sum of consecutive naturals, for example, 5833795 + ... + 5833836.

It is an arithmetic number, because the mean of its divisors is an integer number (46670528).

Almost surely, 2^245020251 is an apocalyptic number.

245020251 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

245020251 is a deficient number, since it is larger than the sum of its proper divisors (128343973).

245020251 is a wasteful number, since it uses less digits than its factorization.

245020251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11667641.

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 245020251 is about 15653.1227235974. The cubic root of 245020251 is about 625.7497145121.

Adding to 245020251 its reverse (152020542), we get a palindrome (397040793).

The spelling of 245020251 in words is "two hundred forty-five million, twenty thousand, two hundred fifty-one".