61540071 has 8 divisors (see below), whose sum is σ = 82089984. Its totient is φ = 41008440.

The previous prime is 61540067. The next prime is 61540081. The reversal of 61540071 is 17004516.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61540071 - 2² = 61540067 is a prime.

It is a super-3 number, since 3×61540071³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61540081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9316 + ... + 14486.

It is an arithmetic number, because the mean of its divisors is an integer number (10261248).

Almost surely, 2^61540071 is an apocalyptic number.

61540071 is a deficient number, since it is larger than the sum of its proper divisors (20549913).

61540071 is a wasteful number, since it uses less digits than its factorization.

61540071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9141.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 61540071 is about 7844.7479883040. The cubic root of 61540071 is about 394.8080485934.

Adding to 61540071 its reverse (17004516), we get a palindrome (78544587).

The spelling of 61540071 in words is "sixty-one million, five hundred forty thousand, seventy-one".