245021331 has 4 divisors (see below), whose sum is σ = 326695112. Its totient is φ = 163347552.

The previous prime is 245021327. The next prime is 245021347. The reversal of 245021331 is 133120542.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 245021331 - 2² = 245021327 is a prime.

It is a super-2 number, since 2×245021331² = 120070905290023122, 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 = 245021298 and 245021307.

It is not an unprimeable number, because it can be changed into a prime (245021831) 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, 40836886 + ... + 40836891.

It is an arithmetic number, because the mean of its divisors is an integer number (81673778).

Almost surely, 2^245021331 is an apocalyptic number.

245021331 is a deficient number, since it is larger than the sum of its proper divisors (81673781).

245021331 is an equidigital number, since it uses as much as digits as its factorization.

245021331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81673780.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 245021331 is about 15653.1572214681. The cubic root of 245021331 is about 625.7506339037.

Adding to 245021331 its reverse (133120542), we get a palindrome (378141873).

The spelling of 245021331 in words is "two hundred forty-five million, twenty-one thousand, three hundred thirty-one".