1051399645 has 4 divisors (see below), whose sum is σ = 1261679580. Its totient is φ = 841119712.

The previous prime is 1051399607. The next prime is 1051399651. The reversal of 1051399645 is 5469931501.

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

It can be written as a sum of positive squares in 2 ways, for example, as 830995929 + 220403716 = 28827^2 + 14846^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051399645 - 2²⁹ = 514528733 is a prime.

It is a super-2 number, since 2×1051399645² = 2210882427012252050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105139960 + ... + 105139969.

It is an arithmetic number, because the mean of its divisors is an integer number (315419895).

Almost surely, 2^1051399645 is an apocalyptic number.

It is an amenable number.

1051399645 is a deficient number, since it is larger than the sum of its proper divisors (210279935).

1051399645 is an equidigital number, since it uses as much as digits as its factorization.

1051399645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210279934.

The product of its (nonzero) digits is 145800, while the sum is 43.

The square root of 1051399645 is about 32425.2932908864. The cubic root of 1051399645 is about 1016.8477734634.

The spelling of 1051399645 in words is "one billion, fifty-one million, three hundred ninety-nine thousand, six hundred forty-five".