142644961 has 2 divisors, whose sum is σ = 142644962. Its totient is φ = 142644960.

The previous prime is 142644959. The next prime is 142644967. The reversal of 142644961 is 169446241.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 96825600 + 45819361 = 9840^2 + 6769^2 .

It is an emirp because it is prime and its reverse (169446241) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 142644961 - 2¹ = 142644959 is a prime.

Together with 142644959, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 142644961.

It is not a weakly prime, because it can be changed into another prime (142644967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71322480 + 71322481.

It is an arithmetic number, because the mean of its divisors is an integer number (71322481).

Almost surely, 2^142644961 is an apocalyptic number.

It is an amenable number.

142644961 is a deficient number, since it is larger than the sum of its proper divisors (1).

142644961 is an equidigital number, since it uses as much as digits as its factorization.

142644961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41472, while the sum is 37.

The square root of 142644961 is about 11943.4065910861. The cubic root of 142644961 is about 522.4990175725.

The spelling of 142644961 in words is "one hundred forty-two million, six hundred forty-four thousand, nine hundred sixty-one".