1981146357 has 40 divisors (see below), whose sum is σ = 3234730752. Its totient is φ = 1202947200.

The previous prime is 1981146337. The next prime is 1981146361. The reversal of 1981146357 is 7536411891.

1981146357 is a `hidden beast` number, since 1 + 9 + 8 + 1 + 1 + 4 + 635 + 7 = 666.

It is not a de Polignac number, because 1981146357 - 2²⁰ = 1980097781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981146317) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 19482 + ... + 65892.

Almost surely, 2^1981146357 is an apocalyptic number.

1981146357 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

1981146357 is a deficient number, since it is larger than the sum of its proper divisors (1253584395).

1981146357 is a wasteful number, since it uses less digits than its factorization.

1981146357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46471 (or 46462 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 1981146357 is about 44510.0702875203. The cubic root of 1981146357 is about 1255.9495270686.

The spelling of 1981146357 in words is "one billion, nine hundred eighty-one million, one hundred forty-six thousand, three hundred fifty-seven".