1254021539 has 2 divisors, whose sum is σ = 1254021540. Its totient is φ = 1254021538.

The previous prime is 1254021487. The next prime is 1254021547. The reversal of 1254021539 is 9351204521.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1254021539 is a prime.

It is not a weakly prime, because it can be changed into another prime (1254021239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 627010769 + 627010770.

It is an arithmetic number, because the mean of its divisors is an integer number (627010770).

Almost surely, 2^1254021539 is an apocalyptic number.

1254021539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1254021539 is an equidigital number, since it uses as much as digits as its factorization.

1254021539 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1254021539 is about 35412.1665391995. The cubic root of 1254021539 is about 1078.3713274404.

The spelling of 1254021539 in words is "one billion, two hundred fifty-four million, twenty-one thousand, five hundred thirty-nine".