126121551 has 8 divisors (see below), whose sum is σ = 173960880. Its totient is φ = 81181632.

The previous prime is 126121549. The next prime is 126121553. The reversal of 126121551 is 155121621.

It is an interprime number because it is at equal distance from previous prime (126121549) and next prime (126121553).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 126121551 - 2¹ = 126121549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126121553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 724750 + ... + 724923.

It is an arithmetic number, because the mean of its divisors is an integer number (21745110).

Almost surely, 2^126121551 is an apocalyptic number.

126121551 is a deficient number, since it is larger than the sum of its proper divisors (47839329).

126121551 is a wasteful number, since it uses less digits than its factorization.

126121551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449705.

The product of its digits is 600, while the sum is 24.

The square root of 126121551 is about 11230.3851670368. The cubic root of 126121551 is about 501.4909510443.

The spelling of 126121551 in words is "one hundred twenty-six million, one hundred twenty-one thousand, five hundred fifty-one".