81875951 has 2 divisors, whose sum is σ = 81875952. Its totient is φ = 81875950.

The previous prime is 81875933. The next prime is 81875957. The reversal of 81875951 is 15957818.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81875951 - 2²⁶ = 14767087 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81875957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40937975 + 40937976.

It is an arithmetic number, because the mean of its divisors is an integer number (40937976).

Almost surely, 2^81875951 is an apocalyptic number.

81875951 is a deficient number, since it is larger than the sum of its proper divisors (1).

81875951 is an equidigital number, since it uses as much as digits as its factorization.

81875951 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 44.

The square root of 81875951 is about 9048.5330855338. The cubic root of 81875951 is about 434.2289613513.

The spelling of 81875951 in words is "eighty-one million, eight hundred seventy-five thousand, nine hundred fifty-one".