945874981 has 2 divisors, whose sum is σ = 945874982. Its totient is φ = 945874980.

The previous prime is 945874973. The next prime is 945874987. The reversal of 945874981 is 189478549.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 945562500 + 312481 = 30750^2 + 559^2 .

It is a cyclic number.

It is not a de Polignac number, because 945874981 - 2³ = 945874973 is a prime.

It is a super-2 number, since 2×945874981² = 1789358959363500722, which contains 22 as substring.

It is a Chen prime.

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

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (945874987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 472937490 + 472937491.

It is an arithmetic number, because the mean of its divisors is an integer number (472937491).

Almost surely, 2^945874981 is an apocalyptic number.

It is an amenable number.

945874981 is a deficient number, since it is larger than the sum of its proper divisors (1).

945874981 is an equidigital number, since it uses as much as digits as its factorization.

945874981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 55.

The square root of 945874981 is about 30755.0805721591. The cubic root of 945874981 is about 981.6226695617.

The spelling of 945874981 in words is "nine hundred forty-five million, eight hundred seventy-four thousand, nine hundred eighty-one".