2038643491 has 2 divisors, whose sum is σ = 2038643492. Its totient is φ = 2038643490.

The previous prime is 2038643449. The next prime is 2038643521. The reversal of 2038643491 is 1943468302.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2038643491 - 2¹¹ = 2038641443 is a prime.

It is not a weakly prime, because it can be changed into another prime (2038643401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1019321745 + 1019321746.

It is an arithmetic number, because the mean of its divisors is an integer number (1019321746).

Almost surely, 2^2038643491 is an apocalyptic number.

2038643491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2038643491 is an equidigital number, since it uses as much as digits as its factorization.

2038643491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 2038643491 is about 45151.3398583032. The cubic root of 2038643491 is about 1267.9839654966.

The spelling of 2038643491 in words is "two billion, thirty-eight million, six hundred forty-three thousand, four hundred ninety-one".