126778051 has 4 divisors (see below), whose sum is σ = 133450600. Its totient is φ = 120105504.

The previous prime is 126778049. The next prime is 126778073. The reversal of 126778051 is 150877621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 150877621 = 199 ⋅758179.

It is a cyclic number.

It is not a de Polignac number, because 126778051 - 2¹ = 126778049 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126778051.

It is not an unprimeable number, because it can be changed into a prime (126778031) 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, 3336246 + ... + 3336283.

It is an arithmetic number, because the mean of its divisors is an integer number (33362650).

Almost surely, 2^126778051 is an apocalyptic number.

126778051 is a deficient number, since it is larger than the sum of its proper divisors (6672549).

126778051 is an equidigital number, since it uses as much as digits as its factorization.

126778051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6672548.

The product of its (nonzero) digits is 23520, while the sum is 37.

The square root of 126778051 is about 11259.5759689253. The cubic root of 126778051 is about 502.3595818968.

The spelling of 126778051 in words is "one hundred twenty-six million, seven hundred seventy-eight thousand, fifty-one".