85429919 has 2 divisors, whose sum is σ = 85429920. Its totient is φ = 85429918.

The previous prime is 85429873. The next prime is 85429957. The reversal of 85429919 is 91992458.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85429919 is a prime.

It is a super-2 number, since 2×85429919² = 14596542120693122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85429999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42714959 + 42714960.

It is an arithmetic number, because the mean of its divisors is an integer number (42714960).

Almost surely, 2^85429919 is an apocalyptic number.

85429919 is a deficient number, since it is larger than the sum of its proper divisors (1).

85429919 is an equidigital number, since it uses as much as digits as its factorization.

85429919 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 47.

The square root of 85429919 is about 9242.8306811279. The cubic root of 85429919 is about 440.4230074547.

The spelling of 85429919 in words is "eighty-five million, four hundred twenty-nine thousand, nine hundred nineteen".