1051544657 has 4 divisors (see below), whose sum is σ = 1068783156. Its totient is φ = 1034306160.

The previous prime is 1051544651. The next prime is 1051544687. The reversal of 1051544657 is 7564451501.

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 258052096 + 793492561 = 16064^2 + 28169^2 .

It is a cyclic number.

It is not a de Polignac number, because 1051544657 - 2²⁰ = 1050496081 is a prime.

It is a super-2 number, since 2×1051544657² = 2211492331330495298, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1051544657.

It is not an unprimeable number, because it can be changed into a prime (1051544651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8619158 + ... + 8619279.

It is an arithmetic number, because the mean of its divisors is an integer number (267195789).

Almost surely, 2^1051544657 is an apocalyptic number.

It is an amenable number.

1051544657 is a deficient number, since it is larger than the sum of its proper divisors (17238499).

1051544657 is an equidigital number, since it uses as much as digits as its factorization.

1051544657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17238498.

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 1051544657 is about 32427.5293076731. The cubic root of 1051544657 is about 1016.8945201505.

The spelling of 1051544657 in words is "one billion, fifty-one million, five hundred forty-four thousand, six hundred fifty-seven".