61281898 has 4 divisors (see below), whose sum is σ = 91922850. Its totient is φ = 30640948.

The previous prime is 61281877. The next prime is 61281911. The reversal of 61281898 is 89818216.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 60109009 + 1172889 = 7753^2 + 1083^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15320473 + ... + 15320476.

Almost surely, 2^61281898 is an apocalyptic number.

61281898 is a deficient number, since it is larger than the sum of its proper divisors (30640952).

61281898 is a wasteful number, since it uses less digits than its factorization.

61281898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30640951.

The product of its digits is 55296, while the sum is 43.

The square root of 61281898 is about 7828.2755444606. The cubic root of 61281898 is about 394.2551749558.

The spelling of 61281898 in words is "sixty-one million, two hundred eighty-one thousand, eight hundred ninety-eight".