120531731 has 2 divisors, whose sum is σ = 120531732. Its totient is φ = 120531730.

The previous prime is 120531647. The next prime is 120531739. The reversal of 120531731 is 137135021.

It is a strong prime.

It is an emirp because it is prime and its reverse (137135021) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 120531731 - 2¹⁸ = 120269587 is a prime.

It is a super-2 number, since 2×120531731² = 29055796355712722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 120531697 and 120531706.

It is not a weakly prime, because it can be changed into another prime (120531739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60265865 + 60265866.

It is an arithmetic number, because the mean of its divisors is an integer number (60265866).

Almost surely, 2^120531731 is an apocalyptic number.

120531731 is a deficient number, since it is larger than the sum of its proper divisors (1).

120531731 is an equidigital number, since it uses as much as digits as its factorization.

120531731 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 120531731 is about 10978.6944123607. The cubic root of 120531731 is about 493.9698755582.

Adding to 120531731 its reverse (137135021), we get a palindrome (257666752).

The spelling of 120531731 in words is "one hundred twenty million, five hundred thirty-one thousand, seven hundred thirty-one".