2215019491 has 2 divisors, whose sum is σ = 2215019492. Its totient is φ = 2215019490.

The previous prime is 2215019489. The next prime is 2215019557. The reversal of 2215019491 is 1949105122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2215019491 - 2¹ = 2215019489 is a prime.

It is a super-2 number, since 2×2215019491² = 9812622691019798162, which contains 22 as substring.

Together with 2215019489, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2215019461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1107509745 + 1107509746.

It is an arithmetic number, because the mean of its divisors is an integer number (1107509746).

Almost surely, 2^2215019491 is an apocalyptic number.

2215019491 is a deficient number, since it is larger than the sum of its proper divisors (1).

2215019491 is an equidigital number, since it uses as much as digits as its factorization.

2215019491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 34.

The square root of 2215019491 is about 47063.9935725816. The cubic root of 2215019491 is about 1303.5444674158.

The spelling of 2215019491 in words is "two billion, two hundred fifteen million, nineteen thousand, four hundred ninety-one".