61649351 has 4 divisors (see below), whose sum is σ = 61675104. Its totient is φ = 61623600.

The previous prime is 61649267. The next prime is 61649431. The reversal of 61649351 is 15394616.

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-61649351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61649051) 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, 8870 + ... + 14211.

It is an arithmetic number, because the mean of its divisors is an integer number (15418776).

Almost surely, 2^61649351 is an apocalyptic number.

61649351 is a deficient number, since it is larger than the sum of its proper divisors (25753).

61649351 is a wasteful number, since it uses less digits than its factorization.

61649351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25752.

The product of its digits is 19440, while the sum is 35.

The square root of 61649351 is about 7851.7100685137. The cubic root of 61649351 is about 395.0416043343.

The spelling of 61649351 in words is "sixty-one million, six hundred forty-nine thousand, three hundred fifty-one".