172235953 has 2 divisors, whose sum is σ = 172235954. Its totient is φ = 172235952.

The previous prime is 172235923. The next prime is 172235963. The reversal of 172235953 is 359532271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98069409 + 74166544 = 9903^2 + 8612^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172235953 is a prime.

It is not a weakly prime, because it can be changed into another prime (172235923) 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, 86117976 + 86117977.

It is an arithmetic number, because the mean of its divisors is an integer number (86117977).

Almost surely, 2^172235953 is an apocalyptic number.

It is an amenable number.

172235953 is a deficient number, since it is larger than the sum of its proper divisors (1).

172235953 is an equidigital number, since it uses as much as digits as its factorization.

172235953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 56700, while the sum is 37.

The square root of 172235953 is about 13123.8695894161. The cubic root of 172235953 is about 556.3839637282.

It can be divided in two parts, 1722 and 35953, that added together give a triangular number (37675 = T₂₇₄).

The spelling of 172235953 in words is "one hundred seventy-two million, two hundred thirty-five thousand, nine hundred fifty-three".