2118405901 has 2 divisors, whose sum is σ = 2118405902. Its totient is φ = 2118405900.

The previous prime is 2118405889. The next prime is 2118405911. The reversal of 2118405901 is 1095048112.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2118392676 + 13225 = 46026^2 + 115^2 .

It is a cyclic number.

It is not a de Polignac number, because 2118405901 - 2¹¹ = 2118403853 is a prime.

It is a super-2 number, since 2×2118405901² = 8975287122783243602, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2118405911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1059202950 + 1059202951.

It is an arithmetic number, because the mean of its divisors is an integer number (1059202951).

Almost surely, 2^2118405901 is an apocalyptic number.

It is an amenable number.

2118405901 is a deficient number, since it is larger than the sum of its proper divisors (1).

2118405901 is an equidigital number, since it uses as much as digits as its factorization.

2118405901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 2118405901 is about 46026.1436685717. The cubic root of 2118405901 is about 1284.3095911193.

The spelling of 2118405901 in words is "two billion, one hundred eighteen million, four hundred five thousand, nine hundred one".