141256721 has 2 divisors, whose sum is σ = 141256722. Its totient is φ = 141256720.

The previous prime is 141256699. The next prime is 141256729. The reversal of 141256721 is 127652141.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133633600 + 7623121 = 11560^2 + 2761^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-141256721 is a prime.

It is a super-2 number, since 2×141256721² = 39906922455343682, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (141256729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70628360 + 70628361.

It is an arithmetic number, because the mean of its divisors is an integer number (70628361).

Almost surely, 2^141256721 is an apocalyptic number.

It is an amenable number.

141256721 is a deficient number, since it is larger than the sum of its proper divisors (1).

141256721 is an equidigital number, since it uses as much as digits as its factorization.

141256721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3360, while the sum is 29.

The square root of 141256721 is about 11885.1470752364. The cubic root of 141256721 is about 520.7984786546.

The spelling of 141256721 in words is "one hundred forty-one million, two hundred fifty-six thousand, seven hundred twenty-one".