245205451 has 4 divisors (see below), whose sum is σ = 245245000. Its totient is φ = 245165904.

The previous prime is 245205437. The next prime is 245205463. The reversal of 245205451 is 154502542.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 154502542 = 2 ⋅77251271.

It is a cyclic number.

It is not a de Polignac number, because 245205451 - 2¹⁹ = 244681163 is a prime.

It is a super-2 number, since 2×245205451² = 120251426400226802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (245205481) 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, 8226 + ... + 23623.

It is an arithmetic number, because the mean of its divisors is an integer number (61311250).

Almost surely, 2^245205451 is an apocalyptic number.

245205451 is a deficient number, since it is larger than the sum of its proper divisors (39549).

245205451 is an equidigital number, since it uses as much as digits as its factorization.

245205451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39548.

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 245205451 is about 15659.0373586629. The cubic root of 245205451 is about 625.9073336756.

Adding to 245205451 its reverse (154502542), we get a palindrome (399707993).

The spelling of 245205451 in words is "two hundred forty-five million, two hundred five thousand, four hundred fifty-one".