1545640001 has 4 divisors (see below), whose sum is σ = 1561574532. Its totient is φ = 1529705472.

The previous prime is 1545639989. The next prime is 1545640003. The reversal of 1545640001 is 1000465451.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1000465451 = 2833 ⋅353147.

It can be written as a sum of positive squares in 2 ways, for example, as 990990400 + 554649601 = 31480^2 + 23551^2 .

It is a cyclic number.

It is not a de Polignac number, because 1545640001 - 2⁶ = 1545639937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1545640003) 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, 7967120 + ... + 7967313.

It is an arithmetic number, because the mean of its divisors is an integer number (390393633).

Almost surely, 2^1545640001 is an apocalyptic number.

It is an amenable number.

1545640001 is a deficient number, since it is larger than the sum of its proper divisors (15934531).

1545640001 is an equidigital number, since it uses as much as digits as its factorization.

1545640001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15934530.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 1545640001 is about 39314.6283334842. The cubic root of 1545640001 is about 1156.2083893046.

The spelling of 1545640001 in words is "one billion, five hundred forty-five million, six hundred forty thousand, one".