146315091581 has 8 divisors (see below), whose sum is σ = 154981288440. Its totient is φ = 137655497728.

The previous prime is 146315091569. The next prime is 146315091697. The reversal of 146315091581 is 185190513641.

It can be written as a sum of positive squares in 4 ways, for example, as 85963308025 + 60351783556 = 293195^2 + 245666^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-146315091581 is a prime.

It is a super-2 number, since 2×146315091581² (a number of 23 digits) 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 (146315091541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1605086 + ... + 1693791.

It is an arithmetic number, because the mean of its divisors is an integer number (19372661055).

Almost surely, 2^146315091581 is an apocalyptic number.

It is an amenable number.

146315091581 is a deficient number, since it is larger than the sum of its proper divisors (8666196859).

146315091581 is a wasteful number, since it uses less digits than its factorization.

146315091581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301503.

The product of its (nonzero) digits is 129600, while the sum is 44.

The spelling of 146315091581 in words is "one hundred forty-six billion, three hundred fifteen million, ninety-one thousand, five hundred eighty-one".