649172 has 6 divisors (see below), whose sum is σ = 1136058. Its totient is φ = 324584.

The previous prime is 649157. The next prime is 649183. The reversal of 649172 is 271946.

It can be written as a sum of positive squares in only one way, i.e., 568516 + 80656 = 754^2 + 284^2 .

It is a nialpdrome in base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649172.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81143 + ... + 81150.

It is an arithmetic number, because the mean of its divisors is an integer number (189343).

2⁶⁴⁹¹⁷² is an apocalyptic number.

It is an amenable number.

649172 is a deficient number, since it is larger than the sum of its proper divisors (486886).

649172 is a wasteful number, since it uses less digits than its factorization.

649172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162297 (or 162295 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 649172 is about 805.7121073932. The cubic root of 649172 is about 86.5871130598.

It can be divided in two parts, 649 and 172, that multiplied together give a triangular number (111628 = T₄₇₂).

The spelling of 649172 in words is "six hundred forty-nine thousand, one hundred seventy-two".