154231532510981 has 2 divisors, whose sum is σ = 154231532510982. Its totient is φ = 154231532510980.

The previous prime is 154231532510969. The next prime is 154231532511137. The reversal of 154231532510981 is 189015235132451.

154231532510981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105102171244225 + 49129361266756 = 10251935^2 + 7009234^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-154231532510981 is a prime.

It is a super-2 number, since 2×154231532510981² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154231532510921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77115766255490 + 77115766255491.

It is an arithmetic number, because the mean of its divisors is an integer number (77115766255491).

Almost surely, 2^{154231532510981} is an apocalyptic number.

It is an amenable number.

154231532510981 is a deficient number, since it is larger than the sum of its proper divisors (1).

154231532510981 is an equidigital number, since it uses as much as digits as its factorization.

154231532510981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296000, while the sum is 50.

The spelling of 154231532510981 in words is "one hundred fifty-four trillion, two hundred thirty-one billion, five hundred thirty-two million, five hundred ten thousand, nine hundred eighty-one".