61649771 has 4 divisors (see below), whose sum is σ = 61962912. Its totient is φ = 61336632.

The previous prime is 61649747. The next prime is 61649801. The reversal of 61649771 is 17794616.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61649771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61649171) 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, 156275 + ... + 156668.

It is an arithmetic number, because the mean of its divisors is an integer number (15490728).

Almost surely, 2^61649771 is an apocalyptic number.

61649771 is a deficient number, since it is larger than the sum of its proper divisors (313141).

61649771 is a wasteful number, since it uses less digits than its factorization.

61649771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313140.

The product of its digits is 63504, while the sum is 41.

The square root of 61649771 is about 7851.7368142342. The cubic root of 61649771 is about 395.0425014354.

The spelling of 61649771 in words is "sixty-one million, six hundred forty-nine thousand, seven hundred seventy-one".