61898491 has 4 divisors (see below), whose sum is σ = 61916400. Its totient is φ = 61880584.

The previous prime is 61898477. The next prime is 61898503. The reversal of 61898491 is 19489816.

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

It is a cyclic number.

It is not a de Polignac number, because 61898491 - 2⁷ = 61898363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61898191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1936 + ... + 11293.

It is an arithmetic number, because the mean of its divisors is an integer number (15479100).

Almost surely, 2^61898491 is an apocalyptic number.

61898491 is a deficient number, since it is larger than the sum of its proper divisors (17909).

61898491 is a wasteful number, since it uses less digits than its factorization.

61898491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17908.

The product of its digits is 124416, while the sum is 46.

The square root of 61898491 is about 7867.5594055590. The cubic root of 61898491 is about 395.5730421082.

The spelling of 61898491 in words is "sixty-one million, eight hundred ninety-eight thousand, four hundred ninety-one".