2145554401 has 2 divisors, whose sum is σ = 2145554402. Its totient is φ = 2145554400.

The previous prime is 2145554393. The next prime is 2145554419. The reversal of 2145554401 is 1044555412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1656083025 + 489471376 = 40695^2 + 22124^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145554401 - 2³ = 2145554393 is a prime.

It is not a weakly prime, because it can be changed into another prime (2145524401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072777200 + 1072777201.

It is an arithmetic number, because the mean of its divisors is an integer number (1072777201).

Almost surely, 2^2145554401 is an apocalyptic number.

It is an amenable number.

2145554401 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145554401 is an equidigital number, since it uses as much as digits as its factorization.

2145554401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 2145554401 is about 46320.1295442921. The cubic root of 2145554401 is about 1289.7726901528.

The spelling of 2145554401 in words is "two billion, one hundred forty-five million, five hundred fifty-four thousand, four hundred one".