120505151891 has 2 divisors, whose sum is σ = 120505151892. Its totient is φ = 120505151890.

The previous prime is 120505151839. The next prime is 120505151951. The reversal of 120505151891 is 198151505021.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120505151891 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (120505351891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60252575945 + 60252575946.

It is an arithmetic number, because the mean of its divisors is an integer number (60252575946).

Almost surely, 2^120505151891 is an apocalyptic number.

120505151891 is a deficient number, since it is larger than the sum of its proper divisors (1).

120505151891 is an equidigital number, since it uses as much as digits as its factorization.

120505151891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18000, while the sum is 38.

The spelling of 120505151891 in words is "one hundred twenty billion, five hundred five million, one hundred fifty-one thousand, eight hundred ninety-one".