61641229 has 8 divisors (see below), whose sum is σ = 66778040. Its totient is φ = 56897568.

The previous prime is 61641227. The next prime is 61641233. The reversal of 61641229 is 92214616.

It can be written as a sum of positive squares in 4 ways, for example, as 17724100 + 43917129 = 4210^2 + 6627^2 .

It is not a de Polignac number, because 61641229 - 2¹ = 61641227 is a prime.

It is a super-2 number, since 2×61641229² = 7599282225260882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61641229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61641227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11832 + ... + 16225.

It is an arithmetic number, because the mean of its divisors is an integer number (8347255).

Almost surely, 2^61641229 is an apocalyptic number.

It is an amenable number.

61641229 is a deficient number, since it is larger than the sum of its proper divisors (5136811).

61641229 is an equidigital number, since it uses as much as digits as its factorization.

61641229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28096 (or 28070 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 61641229 is about 7851.1928393079. The cubic root of 61641229 is about 395.0242553070.

The spelling of 61641229 in words is "sixty-one million, six hundred forty-one thousand, two hundred twenty-nine".