1422187691 has 2 divisors, whose sum is σ = 1422187692. Its totient is φ = 1422187690.

The previous prime is 1422187661. The next prime is 1422187703. The reversal of 1422187691 is 1967812241.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1422187691 is a prime.

It is a super-2 number, since 2×1422187691² = 4045235656863822962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1422187621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 711093845 + 711093846.

It is an arithmetic number, because the mean of its divisors is an integer number (711093846).

Almost surely, 2^1422187691 is an apocalyptic number.

1422187691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1422187691 is an equidigital number, since it uses as much as digits as its factorization.

1422187691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 41.

The square root of 1422187691 is about 37711.9038368524. The cubic root of 1422187691 is about 1124.5677855076.

The spelling of 1422187691 in words is "one billion, four hundred twenty-two million, one hundred eighty-seven thousand, six hundred ninety-one".