172400953 has 2 divisors, whose sum is σ = 172400954. Its totient is φ = 172400952.

The previous prime is 172400929. The next prime is 172400957. The reversal of 172400953 is 359004271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105945849 + 66455104 = 10293^2 + 8152^2 .

It is an emirp because it is prime and its reverse (359004271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 172400953 - 2¹³ = 172392761 is a prime.

It is not a weakly prime, because it can be changed into another prime (172400957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86200476 + 86200477.

It is an arithmetic number, because the mean of its divisors is an integer number (86200477).

Almost surely, 2^172400953 is an apocalyptic number.

It is an amenable number.

172400953 is a deficient number, since it is larger than the sum of its proper divisors (1).

172400953 is an equidigital number, since it uses as much as digits as its factorization.

172400953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 172400953 is about 13130.1543402962. The cubic root of 172400953 is about 556.5615767691.

The spelling of 172400953 in words is "one hundred seventy-two million, four hundred thousand, nine hundred fifty-three".