61581098 has 16 divisors (see below), whose sum is σ = 97186824. Its totient is φ = 29226240.

The previous prime is 61581067. The next prime is 61581101. The reversal of 61581098 is 89018516.

It can be written as a sum of positive squares in 4 ways, for example, as 49519369 + 12061729 = 7037^2 + 3473^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7115 + ... + 13182.

Almost surely, 2^61581098 is an apocalyptic number.

61581098 is a deficient number, since it is larger than the sum of its proper divisors (35605726).

61581098 is a wasteful number, since it uses less digits than its factorization.

61581098 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20377.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 61581098 is about 7847.3624868487. The cubic root of 61581098 is about 394.8957648371.

The spelling of 61581098 in words is "sixty-one million, five hundred eighty-one thousand, ninety-eight".