61549231 has 16 divisors (see below), whose sum is σ = 66594528. Its totient is φ = 56678400.

The previous prime is 61549207. The next prime is 61549237. The reversal of 61549231 is 13294516.

It is a cyclic number.

It is not a de Polignac number, because 61549231 - 2²³ = 53160623 is a prime.

It is a super-2 number, since 2×61549231² = 7576615673382722, which contains 22 as substring.

It is a Duffinian number.

61549231 is a modest number, since divided by 9231 gives 6154 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 61549193 and 61549202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61549237) 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, 255271 + ... + 255511.

It is an arithmetic number, because the mean of its divisors is an integer number (4162158).

Almost surely, 2^61549231 is an apocalyptic number.

61549231 is a deficient number, since it is larger than the sum of its proper divisors (5045297).

61549231 is a wasteful number, since it uses less digits than its factorization.

61549231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522.

The product of its digits is 6480, while the sum is 31.

The square root of 61549231 is about 7845.3317966801. The cubic root of 61549231 is about 394.8276361686.

The spelling of 61549231 in words is "sixty-one million, five hundred forty-nine thousand, two hundred thirty-one".