249551642 has 4 divisors (see below), whose sum is σ = 374327466. Its totient is φ = 124775820.

The previous prime is 249551629. The next prime is 249551677. The reversal of 249551642 is 246155942.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 235346281 + 14205361 = 15341^2 + 3769^2 .

It is a junction number, because it is equal to n+sod(n) for n = 249551596 and 249551605.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 62387909 + ... + 62387912.

Almost surely, 2^249551642 is an apocalyptic number.

249551642 is a deficient number, since it is larger than the sum of its proper divisors (124775824).

249551642 is a wasteful number, since it uses less digits than its factorization.

249551642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124775823.

The product of its digits is 86400, while the sum is 38.

The square root of 249551642 is about 15797.2036132981. The cubic root of 249551642 is about 629.5837024677.

The spelling of 249551642 in words is "two hundred forty-nine million, five hundred fifty-one thousand, six hundred forty-two".