2125135381 has 2 divisors, whose sum is σ = 2125135382. Its totient is φ = 2125135380.

The previous prime is 2125135357. The next prime is 2125135387. The reversal of 2125135381 is 1835315212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2007846481 + 117288900 = 44809^2 + 10830^2 .

It is a cyclic number.

It is not a de Polignac number, because 2125135381 - 2⁷ = 2125135253 is a prime.

It is a super-2 number, since 2×2125135381² = 9032400775156030322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2125135387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1062567690 + 1062567691.

It is an arithmetic number, because the mean of its divisors is an integer number (1062567691).

Almost surely, 2^2125135381 is an apocalyptic number.

It is an amenable number.

2125135381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2125135381 is an equidigital number, since it uses as much as digits as its factorization.

2125135381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 2125135381 is about 46099.1906761930. The cubic root of 2125135381 is about 1285.6680969198.

The spelling of 2125135381 in words is "two billion, one hundred twenty-five million, one hundred thirty-five thousand, three hundred eighty-one".