862191401 has 2 divisors, whose sum is σ = 862191402. Its totient is φ = 862191400.

The previous prime is 862191389. The next prime is 862191403. The reversal of 862191401 is 104191268.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 794112400 + 68079001 = 28180^2 + 8251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-862191401 is a prime.

Together with 862191403, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (862191403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 431095700 + 431095701.

It is an arithmetic number, because the mean of its divisors is an integer number (431095701).

Almost surely, 2^862191401 is an apocalyptic number.

It is an amenable number.

862191401 is a deficient number, since it is larger than the sum of its proper divisors (1).

862191401 is an equidigital number, since it uses as much as digits as its factorization.

862191401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 862191401 is about 29363.0959028506. The cubic root of 862191401 is about 951.7755900830.

The spelling of 862191401 in words is "eight hundred sixty-two million, one hundred ninety-one thousand, four hundred one".