1650001381 has 16 divisors (see below), whose sum is σ = 1949409280. Its totient is φ = 1366651440.

The previous prime is 1650001373. The next prime is 1650001387. The reversal of 1650001381 is 1831000561.

It is not a de Polignac number, because 1650001381 - 2³ = 1650001373 is a prime.

It is a super-2 number, since 2×1650001381² = 5445009114603814322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1650001387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152530 + ... + 162988.

It is an arithmetic number, because the mean of its divisors is an integer number (121838080).

Almost surely, 2^1650001381 is an apocalyptic number.

It is an amenable number.

1650001381 is a deficient number, since it is larger than the sum of its proper divisors (299407899).

1650001381 is a wasteful number, since it uses less digits than its factorization.

1650001381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11224.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1650001381 is about 40620.2090221111. The cubic root of 1650001381 is about 1181.6660801402. Note that the first 3 decimals are identical.

The spelling of 1650001381 in words is "one billion, six hundred fifty million, one thousand, three hundred eighty-one".