1371428581 has 2 divisors, whose sum is σ = 1371428582. Its totient is φ = 1371428580.

The previous prime is 1371428563. The next prime is 1371428587. The reversal of 1371428581 is 1858241731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1118300481 + 253128100 = 33441^2 + 15910^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371428581 - 2¹³ = 1371420389 is a prime.

It is a super-2 number, since 2×1371428581² = 3761632705567347122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1371428587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 685714290 + 685714291.

It is an arithmetic number, because the mean of its divisors is an integer number (685714291).

Almost surely, 2^1371428581 is an apocalyptic number.

It is an amenable number.

1371428581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1371428581 is an equidigital number, since it uses as much as digits as its factorization.

1371428581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 40.

The square root of 1371428581 is about 37032.8041201311. The cubic root of 1371428581 is about 1111.0264511603.

The spelling of 1371428581 in words is "one billion, three hundred seventy-one million, four hundred twenty-eight thousand, five hundred eighty-one".