141761981 has 2 divisors, whose sum is σ = 141761982. Its totient is φ = 141761980.

The previous prime is 141761953. The next prime is 141761993. The reversal of 141761981 is 189167141.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104734756 + 37027225 = 10234^2 + 6085^2 .

It is an emirp because it is prime and its reverse (189167141) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-141761981 is a prime.

It is a super-2 number, since 2×141761981² = 40192918514088722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (141761941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70880990 + 70880991.

It is an arithmetic number, because the mean of its divisors is an integer number (70880991).

Almost surely, 2^141761981 is an apocalyptic number.

It is an amenable number.

141761981 is a deficient number, since it is larger than the sum of its proper divisors (1).

141761981 is an equidigital number, since it uses as much as digits as its factorization.

141761981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 38.

The square root of 141761981 is about 11906.3840438649. The cubic root of 141761981 is about 521.4186863633.

The spelling of 141761981 in words is "one hundred forty-one million, seven hundred sixty-one thousand, nine hundred eighty-one".