1964525641 has 4 divisors (see below), whose sum is σ = 2115643012. Its totient is φ = 1813408272.

The previous prime is 1964525623. The next prime is 1964525659. The reversal of 1964525641 is 1465254691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1465254691 = 67 ⋅21869473.

It is an interprime number because it is at equal distance from previous prime (1964525623) and next prime (1964525659).

It can be written as a sum of positive squares in 2 ways, for example, as 156150016 + 1808375625 = 12496^2 + 42525^2 .

It is not a de Polignac number, because 1964525641 - 2⁵ = 1964525609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1964525621) 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, 75558666 + ... + 75558691.

It is an arithmetic number, because the mean of its divisors is an integer number (528910753).

Almost surely, 2^1964525641 is an apocalyptic number.

It is an amenable number.

1964525641 is a deficient number, since it is larger than the sum of its proper divisors (151117371).

1964525641 is a wasteful number, since it uses less digits than its factorization.

1964525641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151117370.

The product of its digits is 259200, while the sum is 43.

The square root of 1964525641 is about 44322.9696771324. The cubic root of 1964525641 is about 1252.4274198018.

The spelling of 1964525641 in words is "one billion, nine hundred sixty-four million, five hundred twenty-five thousand, six hundred forty-one".