891429389 has 2 divisors, whose sum is σ = 891429390. Its totient is φ = 891429388.

The previous prime is 891429361. The next prime is 891429491. The reversal of 891429389 is 983924198.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 565012900 + 326416489 = 23770^2 + 18067^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-891429389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 891429389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (891449389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 445714694 + 445714695.

It is an arithmetic number, because the mean of its divisors is an integer number (445714695).

Almost surely, 2^891429389 is an apocalyptic number.

It is an amenable number.

891429389 is a deficient number, since it is larger than the sum of its proper divisors (1).

891429389 is an equidigital number, since it uses as much as digits as its factorization.

891429389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 53.

The square root of 891429389 is about 29856.8147832283. The cubic root of 891429389 is about 962.4148510495.

The spelling of 891429389 in words is "eight hundred ninety-one million, four hundred twenty-nine thousand, three hundred eighty-nine".