146783981 has 2 divisors, whose sum is σ = 146783982. Its totient is φ = 146783980.

The previous prime is 146783939. The next prime is 146784013. The reversal of 146783981 is 189387641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129185956 + 17598025 = 11366^2 + 4195^2 .

It is an emirp because it is prime and its reverse (189387641) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 146783981 - 2¹⁰ = 146782957 is a prime.

It is a super-2 number, since 2×146783981² = 43091074156416722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (146783081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73391990 + 73391991.

It is an arithmetic number, because the mean of its divisors is an integer number (73391991).

Almost surely, 2^146783981 is an apocalyptic number.

It is an amenable number.

146783981 is a deficient number, since it is larger than the sum of its proper divisors (1).

146783981 is an equidigital number, since it uses as much as digits as its factorization.

146783981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 146783981 is about 12115.4439043726. The cubic root of 146783981 is about 527.5045630506.

The spelling of 146783981 in words is "one hundred forty-six million, seven hundred eighty-three thousand, nine hundred eighty-one".