142439569 has 2 divisors, whose sum is σ = 142439570. Its totient is φ = 142439568.

The previous prime is 142439533. The next prime is 142439639. The reversal of 142439569 is 965934241.

142439569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86713344 + 55726225 = 9312^2 + 7465^2 .

It is a cyclic number.

It is not a de Polignac number, because 142439569 - 2⁷ = 142439441 is a prime.

It is a super-2 number, since 2×142439569² = 40578061633811522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (142439509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71219784 + 71219785.

It is an arithmetic number, because the mean of its divisors is an integer number (71219785).

Almost surely, 2^142439569 is an apocalyptic number.

It is an amenable number.

142439569 is a deficient number, since it is larger than the sum of its proper divisors (1).

142439569 is an equidigital number, since it uses as much as digits as its factorization.

142439569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 142439569 is about 11934.8049418497. The cubic root of 142439569 is about 522.2481180274.

The spelling of 142439569 in words is "one hundred forty-two million, four hundred thirty-nine thousand, five hundred sixty-nine".