61531677 has 16 divisors (see below), whose sum is σ = 91316160. Its totient is φ = 40950000.

The previous prime is 61531669. The next prime is 61531697. The reversal of 61531677 is 77613516.

61531677 is a `hidden beast` number, since 61 + 531 + 67 + 7 = 666.

It is not a de Polignac number, because 61531677 - 2³ = 61531669 is a prime.

It is a super-2 number, since 2×61531677² = 7572294548864658, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61531607) 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, 17302 + ... + 20552.

It is an arithmetic number, because the mean of its divisors is an integer number (5707260).

Almost surely, 2^61531677 is an apocalyptic number.

It is an amenable number.

61531677 is a deficient number, since it is larger than the sum of its proper divisors (29784483).

61531677 is a wasteful number, since it uses less digits than its factorization.

61531677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3961 (or 3955 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 61531677 is about 7844.2129624329. The cubic root of 61531677 is about 394.7900973117.

The spelling of 61531677 in words is "sixty-one million, five hundred thirty-one thousand, six hundred seventy-seven".