1813923541 has 2 divisors, whose sum is σ = 1813923542. Its totient is φ = 1813923540.

The previous prime is 1813923509. The next prime is 1813923563. The reversal of 1813923541 is 1453293181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1776285316 + 37638225 = 42146^2 + 6135^2 .

It is a cyclic number.

It is not a de Polignac number, because 1813923541 - 2⁵ = 1813923509 is a prime.

It is a super-2 number, since 2×1813923541² = 6580637225187957362, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1813923541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1813920541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906961770 + 906961771.

It is an arithmetic number, because the mean of its divisors is an integer number (906961771).

Almost surely, 2^1813923541 is an apocalyptic number.

It is an amenable number.

1813923541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1813923541 is an equidigital number, since it uses as much as digits as its factorization.

1813923541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 37.

The square root of 1813923541 is about 42590.1812745614. The cubic root of 1813923541 is about 1219.5688571047.

The spelling of 1813923541 in words is "one billion, eight hundred thirteen million, nine hundred twenty-three thousand, five hundred forty-one".