1051665601 has 4 divisors (see below), whose sum is σ = 1201903552. Its totient is φ = 901427652.

The previous prime is 1051665581. The next prime is 1051665649. The reversal of 1051665601 is 1065661501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1065661501 = 22031 ⋅48371.

It is a cyclic number.

It is not a de Polignac number, because 1051665601 - 2⁷ = 1051665473 is a prime.

It is a super-2 number, since 2×1051665601² = 2212001072653382402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1051665661) 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, 75118965 + ... + 75118978.

It is an arithmetic number, because the mean of its divisors is an integer number (300475888).

Almost surely, 2^1051665601 is an apocalyptic number.

It is an amenable number.

1051665601 is a deficient number, since it is larger than the sum of its proper divisors (150237951).

1051665601 is an equidigital number, since it uses as much as digits as its factorization.

1051665601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150237950.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1051665601 is about 32429.3940893135. The cubic root of 1051665601 is about 1016.9335048876.

The spelling of 1051665601 in words is "one billion, fifty-one million, six hundred sixty-five thousand, six hundred one".