154981 has 2 divisors, whose sum is σ = 154982. Its totient is φ = 154980.

The previous prime is 154943. The next prime is 154991. The reversal of 154981 is 189451.

It is a happy number.

154981 is an esthetic number in base 8, because in such base its adjacent digits differ by 1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133956 + 21025 = 366^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 154981 - 2¹⁷ = 23909 is a prime.

It is a super-2 number, since 2×154981² = 48038220722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77490 + 77491.

It is an arithmetic number, because the mean of its divisors is an integer number (77491).

2¹⁵⁴⁹⁸¹ is an apocalyptic number.

It is an amenable number.

154981 is a deficient number, since it is larger than the sum of its proper divisors (1).

154981 is an equidigital number, since it uses as much as digits as its factorization.

154981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1440, while the sum is 28.

The square root of 154981 is about 393.6762629369. The cubic root of 154981 is about 53.7146585776.

The spelling of 154981 in words is "one hundred fifty-four thousand, nine hundred eighty-one".