1254123989 has 2 divisors, whose sum is σ = 1254123990. Its totient is φ = 1254123988.

The previous prime is 1254123971. The next prime is 1254124021. The reversal of 1254123989 is 9893214521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1012321489 + 241802500 = 31817^2 + 15550^2 .

It is a cyclic number.

It is not a de Polignac number, because 1254123989 - 2¹⁶ = 1254058453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1254123919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627061994 + 627061995.

It is an arithmetic number, because the mean of its divisors is an integer number (627061995).

Almost surely, 2^1254123989 is an apocalyptic number.

It is an amenable number.

1254123989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254123989 is an equidigital number, since it uses as much as digits as its factorization.

1254123989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 1254123989 is about 35413.6130463978. The cubic root of 1254123989 is about 1078.4006932661.

The spelling of 1254123989 in words is "one billion, two hundred fifty-four million, one hundred twenty-three thousand, nine hundred eighty-nine".