2151849638 has 4 divisors (see below), whose sum is σ = 3227774460. Its totient is φ = 1075924818.

The previous prime is 2151849631. The next prime is 2151849641. The reversal of 2151849638 is 8369481512.

It is a happy number.

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

It is a super-3 number, since 3×2151849638³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2151849592 and 2151849601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2151849631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 537962408 + ... + 537962411.

It is an arithmetic number, because the mean of its divisors is an integer number (806943615).

Almost surely, 2^2151849638 is an apocalyptic number.

2151849638 is a deficient number, since it is larger than the sum of its proper divisors (1075924822).

2151849638 is a wasteful number, since it uses less digits than its factorization.

2151849638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075924821.

The product of its digits is 414720, while the sum is 47.

The square root of 2151849638 is about 46388.0333491300. The cubic root of 2151849638 is about 1291.0328922791.

The spelling of 2151849638 in words is "two billion, one hundred fifty-one million, eight hundred forty-nine thousand, six hundred thirty-eight".