1551042439 has 2 divisors, whose sum is σ = 1551042440. Its totient is φ = 1551042438.

The previous prime is 1551042401. The next prime is 1551042457. The reversal of 1551042439 is 9342401551.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1551042439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1551042139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 775521219 + 775521220.

It is an arithmetic number, because the mean of its divisors is an integer number (775521220).

Almost surely, 2^1551042439 is an apocalyptic number.

1551042439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1551042439 is an equidigital number, since it uses as much as digits as its factorization.

1551042439 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1551042439 is about 39383.2761334046. The cubic root of 1551042439 is about 1157.5539119075.

The spelling of 1551042439 in words is "one billion, five hundred fifty-one million, forty-two thousand, four hundred thirty-nine".