981861541 has 2 divisors, whose sum is σ = 981861542. Its totient is φ = 981861540.

The previous prime is 981861479. The next prime is 981861547. The reversal of 981861541 is 145168189.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 919908900 + 61952641 = 30330^2 + 7871^2 .

It is a cyclic number.

It is not a de Polignac number, because 981861541 - 2²³ = 973472933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (981861547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 490930770 + 490930771.

It is an arithmetic number, because the mean of its divisors is an integer number (490930771).

Almost surely, 2^981861541 is an apocalyptic number.

It is an amenable number.

981861541 is a deficient number, since it is larger than the sum of its proper divisors (1).

981861541 is an equidigital number, since it uses as much as digits as its factorization.

981861541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69120, while the sum is 43.

The square root of 981861541 is about 31334.6699519877. The cubic root of 981861541 is about 993.9169181477.

The spelling of 981861541 in words is "nine hundred eighty-one million, eight hundred sixty-one thousand, five hundred forty-one".