61646351 has 4 divisors (see below), whose sum is σ = 66388392. Its totient is φ = 56904312.

The previous prime is 61646309. The next prime is 61646357. The reversal of 61646351 is 15364616.

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 61646351 - 2⁶ = 61646287 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 (61646357) 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, 2371001 + ... + 2371026.

It is an arithmetic number, because the mean of its divisors is an integer number (16597098).

Almost surely, 2^61646351 is an apocalyptic number.

61646351 is a deficient number, since it is larger than the sum of its proper divisors (4742041).

61646351 is a wasteful number, since it uses less digits than its factorization.

61646351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4742040.

The product of its digits is 12960, while the sum is 32.

The square root of 61646351 is about 7851.5190250040. The cubic root of 61646351 is about 395.0351963510.

The spelling of 61646351 in words is "sixty-one million, six hundred forty-six thousand, three hundred fifty-one".