64532251 has 16 divisors (see below), whose sum is σ = 75398400. Its totient is φ = 54092448.

The previous prime is 64532249. The next prime is 64532261. The reversal of 64532251 is 15223546.

It is a cyclic number.

It is not a de Polignac number, because 64532251 - 2¹ = 64532249 is a prime.

It is a super-2 number, since 2×64532251² = 8328822838254002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64532201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62820 + ... + 63838.

It is an arithmetic number, because the mean of its divisors is an integer number (4712400).

Almost surely, 2^64532251 is an apocalyptic number.

64532251 is a deficient number, since it is larger than the sum of its proper divisors (10866149).

64532251 is a wasteful number, since it uses less digits than its factorization.

64532251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218.

The product of its digits is 7200, while the sum is 28.

The square root of 64532251 is about 8033.1968107348. The cubic root of 64532251 is about 401.1057964684.

Adding to 64532251 its reverse (15223546), we get a palindrome (79755797).

It can be divided in two parts, 645 and 32251, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 64532251 in words is "sixty-four million, five hundred thirty-two thousand, two hundred fifty-one".