60721231 has 2 divisors, whose sum is σ = 60721232. Its totient is φ = 60721230.

The previous prime is 60721211. The next prime is 60721247. The reversal of 60721231 is 13212706.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 60721231 - 2¹⁹ = 60196943 is a prime.

It is a super-4 number, since 4×60721231⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (60721201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30360615 + 30360616.

It is an arithmetic number, because the mean of its divisors is an integer number (30360616).

Almost surely, 2^60721231 is an apocalyptic number.

60721231 is a deficient number, since it is larger than the sum of its proper divisors (1).

60721231 is an equidigital number, since it uses as much as digits as its factorization.

60721231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 60721231 is about 7792.3828833034. The cubic root of 60721231 is about 393.0491449223.

Adding to 60721231 its reverse (13212706), we get a palindrome (73933937).

The spelling of 60721231 in words is "sixty million, seven hundred twenty-one thousand, two hundred thirty-one".