154019989 has 2 divisors, whose sum is σ = 154019990. Its totient is φ = 154019988.

The previous prime is 154019953. The next prime is 154020007. The reversal of 154019989 is 989910451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136656100 + 17363889 = 11690^2 + 4167^2 .

It is a cyclic number.

It is not a de Polignac number, because 154019989 - 2⁷ = 154019861 is a prime.

It is a super-4 number, since 4×154019989⁴ (a number of 34 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (154019939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77009994 + 77009995.

It is an arithmetic number, because the mean of its divisors is an integer number (77009995).

Almost surely, 2^154019989 is an apocalyptic number.

It is an amenable number.

154019989 is a deficient number, since it is larger than the sum of its proper divisors (1).

154019989 is an equidigital number, since it uses as much as digits as its factorization.

154019989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 46.

The square root of 154019989 is about 12410.4789996196. The cubic root of 154019989 is about 536.0340312636.

The spelling of 154019989 in words is "one hundred fifty-four million, nineteen thousand, nine hundred eighty-nine".