1051491321 has 16 divisors (see below), whose sum is σ = 1567328320. Its totient is φ = 696690720.

The previous prime is 1051491319. The next prime is 1051491377. The reversal of 1051491321 is 1231941501.

It is a happy number.

1051491321 is a `hidden beast` number, since 10 + 514 + 9 + 132 + 1 = 666.

It is not a de Polignac number, because 1051491321 - 2¹ = 1051491319 is a prime.

It is a super-2 number, since 2×1051491321² = 2211267996276650082, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1051491121) 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, 115060 + ... + 123861.

It is an arithmetic number, because the mean of its divisors is an integer number (97958020).

Almost surely, 2^1051491321 is an apocalyptic number.

It is an amenable number.

1051491321 is a deficient number, since it is larger than the sum of its proper divisors (515836999).

1051491321 is a wasteful number, since it uses less digits than its factorization.

1051491321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239093 (or 239087 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 1051491321 is about 32426.7069095830. The cubic root of 1051491321 is about 1016.8773270296.

The spelling of 1051491321 in words is "one billion, fifty-one million, four hundred ninety-one thousand, three hundred twenty-one".