61649953 has 4 divisors (see below), whose sum is σ = 61774000. Its totient is φ = 61525908.

The previous prime is 61649923. The next prime is 61649957. The reversal of 61649953 is 35994616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61649953 - 2⁵ = 61649921 is a prime.

It is a super-3 number, since 3×61649953³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61649957) 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, 61275 + ... + 62272.

It is an arithmetic number, because the mean of its divisors is an integer number (15443500).

Almost surely, 2^61649953 is an apocalyptic number.

It is an amenable number.

61649953 is a deficient number, since it is larger than the sum of its proper divisors (124047).

61649953 is a wasteful number, since it uses less digits than its factorization.

61649953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124046.

The product of its digits is 174960, while the sum is 43.

The square root of 61649953 is about 7851.7484040181. The cubic root of 61649953 is about 395.0428901779.

The spelling of 61649953 in words is "sixty-one million, six hundred forty-nine thousand, nine hundred fifty-three".