126649251 has 10 divisors (see below), whose sum is σ = 189192212. Its totient is φ = 84432780.

The previous prime is 126649241. The next prime is 126649273. The reversal of 126649251 is 152946621.

126649251 is a `hidden beast` number, since 1 + 2 + 6 + 649 + 2 + 5 + 1 = 666.

It is not a de Polignac number, because 126649251 - 2⁵ = 126649219 is a prime.

It is a super-2 number, since 2×126649251² = 32080065557722002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126649241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 781705 + ... + 781866.

Almost surely, 2^126649251 is an apocalyptic number.

126649251 is a deficient number, since it is larger than the sum of its proper divisors (62542961).

126649251 is an equidigital number, since it uses as much as digits as its factorization.

126649251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563583 (or 1563574 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 126649251 is about 11253.8549395307. The cubic root of 126649251 is about 502.1894003921.

The spelling of 126649251 in words is "one hundred twenty-six million, six hundred forty-nine thousand, two hundred fifty-one".