134445721 has 2 divisors, whose sum is σ = 134445722. Its totient is φ = 134445720.

The previous prime is 134445697. The next prime is 134445743. The reversal of 134445721 is 127544431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124077321 + 10368400 = 11139^2 + 3220^2 .

It is a cyclic number.

It is not a de Polignac number, because 134445721 - 2¹³ = 134437529 is a prime.

It is not a weakly prime, because it can be changed into another prime (134445761) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 67222860 + 67222861.

It is an arithmetic number, because the mean of its divisors is an integer number (67222861).

Almost surely, 2^134445721 is an apocalyptic number.

It is an amenable number.

134445721 is a deficient number, since it is larger than the sum of its proper divisors (1).

134445721 is an equidigital number, since it uses as much as digits as its factorization.

134445721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13440, while the sum is 31.

The square root of 134445721 is about 11595.0731347413. The cubic root of 134445721 is about 512.2897440923.

The spelling of 134445721 in words is "one hundred thirty-four million, four hundred forty-five thousand, seven hundred twenty-one".