85725019 has 2 divisors, whose sum is σ = 85725020. Its totient is φ = 85725018.

The previous prime is 85725007. The next prime is 85725023. The reversal of 85725019 is 91052758.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85725019 - 2⁵ = 85724987 is a prime.

It is a super-2 number, since 2×85725019² = 14697557765100722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85725119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42862509 + 42862510.

It is an arithmetic number, because the mean of its divisors is an integer number (42862510).

Almost surely, 2^85725019 is an apocalyptic number.

85725019 is a deficient number, since it is larger than the sum of its proper divisors (1).

85725019 is an equidigital number, since it uses as much as digits as its factorization.

85725019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 37.

The square root of 85725019 is about 9258.7806432597. The cubic root of 85725019 is about 440.9295414161.

The spelling of 85725019 in words is "eighty-five million, seven hundred twenty-five thousand, nineteen".