142561649 has 2 divisors, whose sum is σ = 142561650. Its totient is φ = 142561648.

The previous prime is 142561637. The next prime is 142561687. The reversal of 142561649 is 946165241.

It is an a-pointer prime, because the next prime (142561687) can be obtained adding 142561649 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120846049 + 21715600 = 10993^2 + 4660^2 .

It is a cyclic number.

It is not a de Polignac number, because 142561649 - 2¹² = 142557553 is a prime.

It is not a weakly prime, because it can be changed into another prime (142561619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71280824 + 71280825.

It is an arithmetic number, because the mean of its divisors is an integer number (71280825).

Almost surely, 2^142561649 is an apocalyptic number.

It is an amenable number.

142561649 is a deficient number, since it is larger than the sum of its proper divisors (1).

142561649 is an equidigital number, since it uses as much as digits as its factorization.

142561649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The square root of 142561649 is about 11939.9182995530. The cubic root of 142561649 is about 522.3972756550.

The spelling of 142561649 in words is "one hundred forty-two million, five hundred sixty-one thousand, six hundred forty-nine".