126193551 has 16 divisors (see below), whose sum is σ = 185243520. Its totient is φ = 75777120.

The previous prime is 126193547. The next prime is 126193603. The reversal of 126193551 is 155391621.

It is not a de Polignac number, because 126193551 - 2² = 126193547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126193351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13945 + ... + 21138.

It is an arithmetic number, because the mean of its divisors is an integer number (11577720).

Almost surely, 2^126193551 is an apocalyptic number.

126193551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126193551 is a deficient number, since it is larger than the sum of its proper divisors (59049969).

126193551 is a wasteful number, since it uses less digits than its factorization.

126193551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35206.

The product of its digits is 8100, while the sum is 33.

The square root of 126193551 is about 11233.5902987424. The cubic root of 126193551 is about 501.5863629159.

The spelling of 126193551 in words is "one hundred twenty-six million, one hundred ninety-three thousand, five hundred fifty-one".