120400051 has 2 divisors, whose sum is σ = 120400052. Its totient is φ = 120400050.

The previous prime is 120400019. The next prime is 120400073. The reversal of 120400051 is 150004021.

It is a strong prime.

It is an emirp because it is prime and its reverse (150004021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120400051 - 2⁵ = 120400019 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (120400081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60200025 + 60200026.

It is an arithmetic number, because the mean of its divisors is an integer number (60200026).

Almost surely, 2^120400051 is an apocalyptic number.

120400051 is a deficient number, since it is larger than the sum of its proper divisors (1).

120400051 is an equidigital number, since it uses as much as digits as its factorization.

120400051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 120400051 is about 10972.6957034268. The cubic root of 120400051 is about 493.7899238988.

Adding to 120400051 its reverse (150004021), we get a palindrome (270404072).

The spelling of 120400051 in words is "one hundred twenty million, four hundred thousand, fifty-one".