1023156641 has 4 divisors (see below), whose sum is σ = 1101861012. Its totient is φ = 944452272.

The previous prime is 1023156559. The next prime is 1023156649. The reversal of 1023156641 is 1466513201.

It is a happy number.

1023156641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 82446400 + 940710241 = 9080^2 + 30671^2 .

It is a cyclic number.

It is not a de Polignac number, because 1023156641 - 2¹⁸ = 1022894497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1023156649) 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, 39352166 + ... + 39352191.

It is an arithmetic number, because the mean of its divisors is an integer number (275465253).

Almost surely, 2^1023156641 is an apocalyptic number.

It is an amenable number.

1023156641 is a deficient number, since it is larger than the sum of its proper divisors (78704371).

1023156641 is an equidigital number, since it uses as much as digits as its factorization.

1023156641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78704370.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1023156641 is about 31986.8198012869. The cubic root of 1023156641 is about 1007.6600540832.

Adding to 1023156641 its reverse (1466513201), we get a palindrome (2489669842).

The spelling of 1023156641 in words is "one billion, twenty-three million, one hundred fifty-six thousand, six hundred forty-one".