1651601001 has 4 divisors (see below), whose sum is σ = 2202134672. Its totient is φ = 1101067332.

The previous prime is 1651600967. The next prime is 1651601033. The reversal of 1651601001 is 1001061561.

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: 1001061561 = 3 ⋅333687187.

It is not a de Polignac number, because 1651601001 - 2¹¹ = 1651598953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1651601801) 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, 275266831 + ... + 275266836.

It is an arithmetic number, because the mean of its divisors is an integer number (550533668).

Almost surely, 2^1651601001 is an apocalyptic number.

It is an amenable number.

1651601001 is a deficient number, since it is larger than the sum of its proper divisors (550533671).

1651601001 is an equidigital number, since it uses as much as digits as its factorization.

1651601001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550533670.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 1651601001 is about 40639.8942050788. The cubic root of 1651601001 is about 1182.0478184450.

Adding to 1651601001 its reverse (1001061561), we get a palindrome (2652662562).

The spelling of 1651601001 in words is "one billion, six hundred fifty-one million, six hundred one thousand, one".