1651889421 has 36 divisors (see below), whose sum is σ = 2989143612. Its totient is φ = 871323264.

The previous prime is 1651889411. The next prime is 1651889453. The reversal of 1651889421 is 1249881561.

It is a happy number.

1651889421 is a `hidden beast` number, since 16 + 518 + 89 + 42 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1059502500 + 592386921 = 32550^2 + 24339^2 .

It is not a de Polignac number, because 1651889421 - 2⁵ = 1651889389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1651889411) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 138336 + ... + 149801.

It is an arithmetic number, because the mean of its divisors is an integer number (83031767).

Almost surely, 2^1651889421 is an apocalyptic number.

It is an amenable number.

1651889421 is a deficient number, since it is larger than the sum of its proper divisors (1337254191).

1651889421 is a wasteful number, since it uses less digits than its factorization.

1651889421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288170 (or 288160 counting only the distinct ones).

The product of its digits is 138240, while the sum is 45.

The square root of 1651889421 is about 40643.4425338209. The cubic root of 1651889421 is about 1182.1166216625.

The spelling of 1651889421 in words is "one billion, six hundred fifty-one million, eight hundred eighty-nine thousand, four hundred twenty-one".