2506190891 has 2 divisors, whose sum is σ = 2506190892. Its totient is φ = 2506190890.

The previous prime is 2506190861. The next prime is 2506190899. The reversal of 2506190891 is 1980916052.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2506190891 - 2¹⁰ = 2506189867 is a prime.

It is not a weakly prime, because it can be changed into another prime (2506190899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1253095445 + 1253095446.

It is an arithmetic number, because the mean of its divisors is an integer number (1253095446).

Almost surely, 2^2506190891 is an apocalyptic number.

2506190891 is a deficient number, since it is larger than the sum of its proper divisors (1).

2506190891 is an equidigital number, since it uses as much as digits as its factorization.

2506190891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 38880, while the sum is 41.

The square root of 2506190891 is about 50061.8706302511. The cubic root of 2506190891 is about 1358.3281957108.

The spelling of 2506190891 in words is "two billion, five hundred six million, one hundred ninety thousand, eight hundred ninety-one".