121010581 has 2 divisors, whose sum is σ = 121010582. Its totient is φ = 121010580.

The previous prime is 121010569. The next prime is 121010633. The reversal of 121010581 is 185010121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77000625 + 44009956 = 8775^2 + 6634^2 .

It is a cyclic number.

It is not a de Polignac number, because 121010581 - 2²¹ = 118913429 is a prime.

It is a super-2 number, since 2×121010581² = 29287121427915122, 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 (121010551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60505290 + 60505291.

It is an arithmetic number, because the mean of its divisors is an integer number (60505291).

Almost surely, 2^121010581 is an apocalyptic number.

It is an amenable number.

121010581 is a deficient number, since it is larger than the sum of its proper divisors (1).

121010581 is an equidigital number, since it uses as much as digits as its factorization.

121010581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 121010581 is about 11000.4809440315. The cubic root of 121010581 is about 494.6231611364.

The spelling of 121010581 in words is "one hundred twenty-one million, ten thousand, five hundred eighty-one".