61642471 has 4 divisors (see below), whose sum is σ = 67246344. Its totient is φ = 56038600.

The previous prime is 61642457. The next prime is 61642501. The reversal of 61642471 is 17424616.

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 61642471 - 2¹⁵ = 61609703 is a prime.

It is a super-3 number, since 3×61642471³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61642411) 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, 2801920 + ... + 2801941.

It is an arithmetic number, because the mean of its divisors is an integer number (16811586).

Almost surely, 2^61642471 is an apocalyptic number.

61642471 is a deficient number, since it is larger than the sum of its proper divisors (5603873).

61642471 is a wasteful number, since it uses less digits than its factorization.

61642471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603872.

The product of its digits is 8064, while the sum is 31.

The square root of 61642471 is about 7851.2719351708. The cubic root of 61642471 is about 395.0269083843.

The spelling of 61642471 in words is "sixty-one million, six hundred forty-two thousand, four hundred seventy-one".