126401551 has 4 divisors (see below), whose sum is σ = 126428400. Its totient is φ = 126374704.

The previous prime is 126401533. The next prime is 126401581. The reversal of 126401551 is 155104621.

It is a happy number.

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 126401551 - 2⁵ = 126401519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126401581) 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, 4291 + ... + 16468.

It is an arithmetic number, because the mean of its divisors is an integer number (31607100).

Almost surely, 2^126401551 is an apocalyptic number.

126401551 is a deficient number, since it is larger than the sum of its proper divisors (26849).

126401551 is an equidigital number, since it uses as much as digits as its factorization.

126401551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26848.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 126401551 is about 11242.8444354621. The cubic root of 126401551 is about 501.8617935119.

The spelling of 126401551 in words is "one hundred twenty-six million, four hundred one thousand, five hundred fifty-one".