2051552381 has 2 divisors, whose sum is σ = 2051552382. Its totient is φ = 2051552380.

The previous prime is 2051552369. The next prime is 2051552411. The reversal of 2051552381 is 1832551502.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1727732356 + 323820025 = 41566^2 + 17995^2 .

It is a cyclic number.

It is not a de Polignac number, because 2051552381 - 2¹⁰ = 2051551357 is a prime.

It is a super-2 number, since 2×2051552381² = 8417734343973538322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2051152381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1025776190 + 1025776191.

It is an arithmetic number, because the mean of its divisors is an integer number (1025776191).

Almost surely, 2^2051552381 is an apocalyptic number.

It is an amenable number.

2051552381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2051552381 is an equidigital number, since it uses as much as digits as its factorization.

2051552381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 2051552381 is about 45294.0656267463. The cubic root of 2051552381 is about 1270.6546691849.

The spelling of 2051552381 in words is "two billion, fifty-one million, five hundred fifty-two thousand, three hundred eighty-one".