72141761 has 4 divisors (see below), whose sum is σ = 76385412. Its totient is φ = 67898112.

The previous prime is 72141721. The next prime is 72141767. The reversal of 72141761 is 16714127.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 52649536 + 19492225 = 7256^2 + 4415^2 .

It is a cyclic number.

It is not a de Polignac number, because 72141761 - 2²⁶ = 5032897 is a prime.

It is a super-2 number, since 2×72141761² = 10408867360362242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72141767) 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, 2121800 + ... + 2121833.

It is an arithmetic number, because the mean of its divisors is an integer number (19096353).

Almost surely, 2^72141761 is an apocalyptic number.

It is an amenable number.

72141761 is a deficient number, since it is larger than the sum of its proper divisors (4243651).

72141761 is a wasteful number, since it uses less digits than its factorization.

72141761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243650.

The product of its digits is 2352, while the sum is 29.

The square root of 72141761 is about 8493.6306135833. The cubic root of 72141761 is about 416.2896178027.

Adding to 72141761 its reverse (16714127), we get a palindrome (88855888).

The spelling of 72141761 in words is "seventy-two million, one hundred forty-one thousand, seven hundred sixty-one".