120851581 has 4 divisors (see below), whose sum is σ = 120960892. Its totient is φ = 120742272.

The previous prime is 120851567. The next prime is 120851597. The reversal of 120851581 is 185158021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 26936100 + 93915481 = 5190^2 + 9691^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-120851581 is a prime.

It is a super-2 number, since 2×120851581² = 29210209260399122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120851551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52980 + ... + 55213.

It is an arithmetic number, because the mean of its divisors is an integer number (30240223).

Almost surely, 2^120851581 is an apocalyptic number.

It is an amenable number.

120851581 is a deficient number, since it is larger than the sum of its proper divisors (109311).

120851581 is a wasteful number, since it uses less digits than its factorization.

120851581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109310.

The product of its (nonzero) digits is 3200, while the sum is 31.

The square root of 120851581 is about 10993.2516117844. The cubic root of 120851581 is about 494.4064320097.

The spelling of 120851581 in words is "one hundred twenty million, eight hundred fifty-one thousand, five hundred eighty-one".