249051220051 has 4 divisors (see below), whose sum is σ = 249744956400. Its totient is φ = 248357483704.

The previous prime is 249051220043. The next prime is 249051220081. The reversal of 249051220051 is 150022150942.

249051220051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 249051220051 - 2³ = 249051220043 is a prime.

It is a super-3 number, since 3×249051220051³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249051219995 and 249051220022.

It is not an unprimeable number, because it can be changed into a prime (249051220081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346867636 + ... + 346868353.

It is an arithmetic number, because the mean of its divisors is an integer number (62436239100).

Almost surely, 2^249051220051 is an apocalyptic number.

249051220051 is a deficient number, since it is larger than the sum of its proper divisors (693736349).

249051220051 is an equidigital number, since it uses as much as digits as its factorization.

249051220051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693736348.

The product of its (nonzero) digits is 7200, while the sum is 31.

Adding to 249051220051 its reverse (150022150942), we get a palindrome (399073370993).

The spelling of 249051220051 in words is "two hundred forty-nine billion, fifty-one million, two hundred twenty thousand, fifty-one".