2478728191 has 2 divisors, whose sum is σ = 2478728192. Its totient is φ = 2478728190.

The previous prime is 2478728173. The next prime is 2478728227. The reversal of 2478728191 is 1918278742.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2478728191 - 2¹⁵ = 2478695423 is a prime.

It is a super-2 number, since 2×2478728191² = 12288186889716264962, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2478728171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1239364095 + 1239364096.

It is an arithmetic number, because the mean of its divisors is an integer number (1239364096).

Almost surely, 2^2478728191 is an apocalyptic number.

2478728191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2478728191 is an equidigital number, since it uses as much as digits as its factorization.

2478728191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 49.

The square root of 2478728191 is about 49786.8274847876. The cubic root of 2478728191 is about 1353.3484671087.

The spelling of 2478728191 in words is "two billion, four hundred seventy-eight million, seven hundred twenty-eight thousand, one hundred ninety-one".