1040551381 has 2 divisors, whose sum is σ = 1040551382. Its totient is φ = 1040551380.

The previous prime is 1040551319. The next prime is 1040551409. The reversal of 1040551381 is 1831550401.

It is an a-pointer prime, because the next prime (1040551409) can be obtained adding 1040551381 to its sum of digits (28).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 573602500 + 466948881 = 23950^2 + 21609^2 .

It is a cyclic number.

It is not a de Polignac number, because 1040551381 - 2¹¹ = 1040549333 is a prime.

It is a super-2 number, since 2×1040551381² = 2165494353002014322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1040501381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520275690 + 520275691.

It is an arithmetic number, because the mean of its divisors is an integer number (520275691).

Almost surely, 2^1040551381 is an apocalyptic number.

It is an amenable number.

1040551381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040551381 is an equidigital number, since it uses as much as digits as its factorization.

1040551381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 1040551381 is about 32257.5786599056. The cubic root of 1040551381 is about 1013.3384224578.

The spelling of 1040551381 in words is "one billion, forty million, five hundred fifty-one thousand, three hundred eighty-one".