2145948381 has 6 divisors (see below), whose sum is σ = 3099703230. Its totient is φ = 1430632248.

The previous prime is 2145948373. The next prime is 2145948421. The reversal of 2145948381 is 1838495412.

2145948381 is a `hidden beast` number, since 21 + 4 + 594 + 8 + 38 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2140542756 + 5405625 = 46266^2 + 2325^2 .

It is not a de Polignac number, because 2145948381 - 2³ = 2145948373 is a prime.

It is a super-2 number, since 2×2145948381² = 9210188907833042322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145948361) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 119219346 + ... + 119219363.

It is an arithmetic number, because the mean of its divisors is an integer number (516617205).

Almost surely, 2^2145948381 is an apocalyptic number.

It is an amenable number.

2145948381 is a deficient number, since it is larger than the sum of its proper divisors (953754849).

2145948381 is a wasteful number, since it uses less digits than its factorization.

2145948381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238438715 (or 238438712 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 2145948381 is about 46324.3821437480. The cubic root of 2145948381 is about 1289.8516306735.

The spelling of 2145948381 in words is "two billion, one hundred forty-five million, nine hundred forty-eight thousand, three hundred eighty-one".