1961232401 has 4 divisors (see below), whose sum is σ = 1967419572. Its totient is φ = 1955045232.

The previous prime is 1961232389. The next prime is 1961232419. The reversal of 1961232401 is 1042321691.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1042321691 = 53 ⋅19666447.

It can be written as a sum of positive squares in 2 ways, for example, as 451987600 + 1509244801 = 21260^2 + 38849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1961232401 - 2¹⁸ = 1960970257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1961232491) 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, 3093110 + ... + 3093743.

It is an arithmetic number, because the mean of its divisors is an integer number (491854893).

Almost surely, 2^1961232401 is an apocalyptic number.

It is an amenable number.

1961232401 is a deficient number, since it is larger than the sum of its proper divisors (6187171).

1961232401 is an equidigital number, since it uses as much as digits as its factorization.

1961232401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6187170.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 1961232401 is about 44285.8036056703. The cubic root of 1961232401 is about 1251.7271912292.

The spelling of 1961232401 in words is "one billion, nine hundred sixty-one million, two hundred thirty-two thousand, four hundred one".