1051661642 has 4 divisors (see below), whose sum is σ = 1577492466. Its totient is φ = 525830820.

The previous prime is 1051661623. The next prime is 1051661657. The reversal of 1051661642 is 2461661501.

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

It can be written as a sum of positive squares in only one way, i.e., 1045164241 + 6497401 = 32329^2 + 2549^2 .

It is a super-2 number, since 2×1051661642² = 2211984418508272328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1051661599 and 1051661608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262915409 + ... + 262915412.

Almost surely, 2^1051661642 is an apocalyptic number.

1051661642 is a deficient number, since it is larger than the sum of its proper divisors (525830824).

1051661642 is an equidigital number, since it uses as much as digits as its factorization.

1051661642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525830823.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 1051661642 is about 32429.3330489543. Note that the first 3 decimals coincide. The cubic root of 1051661642 is about 1016.9322288024.

The spelling of 1051661642 in words is "one billion, fifty-one million, six hundred sixty-one thousand, six hundred forty-two".