981355601 has 2 divisors, whose sum is σ = 981355602. Its totient is φ = 981355600.

The previous prime is 981355597. The next prime is 981355637. The reversal of 981355601 is 106553189.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 796368400 + 184987201 = 28220^2 + 13601^2 .

It is a cyclic number.

It is not a de Polignac number, because 981355601 - 2² = 981355597 is a prime.

It is a super-2 number, since 2×981355601² = 1926117631228142402, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (981355801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490677800 + 490677801.

It is an arithmetic number, because the mean of its divisors is an integer number (490677801).

Almost surely, 2^981355601 is an apocalyptic number.

It is an amenable number.

981355601 is a deficient number, since it is larger than the sum of its proper divisors (1).

981355601 is an equidigital number, since it uses as much as digits as its factorization.

981355601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 981355601 is about 31326.5957454684. The cubic root of 981355601 is about 993.7461714922.

The spelling of 981355601 in words is "nine hundred eighty-one million, three hundred fifty-five thousand, six hundred one".