142521091 has 2 divisors, whose sum is σ = 142521092. Its totient is φ = 142521090.

The previous prime is 142521089. The next prime is 142521101. The reversal of 142521091 is 190125241.

It is a happy number.

142521091 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 is a cyclic number.

It is not a de Polignac number, because 142521091 - 2¹ = 142521089 is a prime.

It is a super-2 number, since 2×142521091² = 40624522759660562, which contains 22 as substring.

Together with 142521089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (142521191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71260545 + 71260546.

It is an arithmetic number, because the mean of its divisors is an integer number (71260546).

Almost surely, 2^142521091 is an apocalyptic number.

142521091 is a deficient number, since it is larger than the sum of its proper divisors (1).

142521091 is an equidigital number, since it uses as much as digits as its factorization.

142521091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 142521091 is about 11938.2197584062. The cubic root of 142521091 is about 522.3477312453.

The spelling of 142521091 in words is "one hundred forty-two million, five hundred twenty-one thousand, ninety-one".