438172901 has 2 divisors, whose sum is σ = 438172902. Its totient is φ = 438172900.

The previous prime is 438172871. The next prime is 438172913. The reversal of 438172901 is 109271834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301890625 + 136282276 = 17375^2 + 11674^2 .

It is a cyclic number.

It is not a de Polignac number, because 438172901 - 2¹⁴ = 438156517 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (438172001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219086450 + 219086451.

It is an arithmetic number, because the mean of its divisors is an integer number (219086451).

Almost surely, 2^438172901 is an apocalyptic number.

It is an amenable number.

438172901 is a deficient number, since it is larger than the sum of its proper divisors (1).

438172901 is an equidigital number, since it uses as much as digits as its factorization.

438172901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 438172901 is about 20932.5798935535. The cubic root of 438172901 is about 759.5362481243.

The spelling of 438172901 in words is "four hundred thirty-eight million, one hundred seventy-two thousand, nine hundred one".