2145497381 has 2 divisors, whose sum is σ = 2145497382. Its totient is φ = 2145497380.

The previous prime is 2145497369. The next prime is 2145497441. The reversal of 2145497381 is 1837945412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2119129156 + 26368225 = 46034^2 + 5135^2 .

It is a cyclic number.

It is not a de Polignac number, because 2145497381 - 2⁶ = 2145497317 is a prime.

It is a super-2 number, since 2×2145497381² = 9206318023755718322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2145497311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1072748690 + 1072748691.

It is an arithmetic number, because the mean of its divisors is an integer number (1072748691).

Almost surely, 2^2145497381 is an apocalyptic number.

It is an amenable number.

2145497381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2145497381 is an equidigital number, since it uses as much as digits as its factorization.

2145497381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 2145497381 is about 46319.5140410605. The cubic root of 2145497381 is about 1289.7612644361.

The spelling of 2145497381 in words is "two billion, one hundred forty-five million, four hundred ninety-seven thousand, three hundred eighty-one".