61649331 has 16 divisors (see below), whose sum is σ = 85244160. Its totient is φ = 39584160.

The previous prime is 61649267. The next prime is 61649431. The reversal of 61649331 is 13394616.

It is not a de Polignac number, because 61649331 - 2⁶ = 61649267 is a prime.

It is a super-2 number, since 2×61649331² = 7601280025495122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61649292 and 61649301.

It is not an unprimeable number, because it can be changed into a prime (61649431) 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, 54336 + ... + 55458.

It is an arithmetic number, because the mean of its divisors is an integer number (5327760).

Almost surely, 2^61649331 is an apocalyptic number.

61649331 is a deficient number, since it is larger than the sum of its proper divisors (23594829).

61649331 is a wasteful number, since it uses less digits than its factorization.

61649331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1786.

The product of its digits is 11664, while the sum is 33.

The square root of 61649331 is about 7851.7087949057. The cubic root of 61649331 is about 395.0415616151.

The spelling of 61649331 in words is "sixty-one million, six hundred forty-nine thousand, three hundred thirty-one".