249949649 has 4 divisors (see below), whose sum is σ = 252424500. Its totient is φ = 247474800.

The previous prime is 249949639. The next prime is 249949663. The reversal of 249949649 is 946949942.

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

It can be written as a sum of positive squares in 2 ways, for example, as 165585424 + 84364225 = 12868^2 + 9185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-249949649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 249949594 and 249949603.

It is not an unprimeable number, because it can be changed into a prime (249949639) 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, 1237274 + ... + 1237475.

It is an arithmetic number, because the mean of its divisors is an integer number (63106125).

Almost surely, 2^249949649 is an apocalyptic number.

It is an amenable number.

249949649 is a deficient number, since it is larger than the sum of its proper divisors (2474851).

249949649 is a wasteful number, since it uses less digits than its factorization.

249949649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474850.

The product of its digits is 5038848, while the sum is 56.

The square root of 249949649 is about 15809.7959822384. The cubic root of 249949649 is about 629.9182299180.

It can be divided in two parts, 24994 and 9649, that added together give a palindrome (34643).

The spelling of 249949649 in words is "two hundred forty-nine million, nine hundred forty-nine thousand, six hundred forty-nine".