20130223961 has 2 divisors, whose sum is σ = 20130223962. Its totient is φ = 20130223960.

The previous prime is 20130223933. The next prime is 20130223979. The reversal of 20130223961 is 16932203102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16038702736 + 4091521225 = 126644^2 + 63965^2 .

It is a cyclic number.

It is not a de Polignac number, because 20130223961 - 2²² = 20126029657 is a prime.

It is not a weakly prime, because it can be changed into another prime (20130423961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10065111980 + 10065111981.

It is an arithmetic number, because the mean of its divisors is an integer number (10065111981).

Almost surely, 2^20130223961 is an apocalyptic number.

It is an amenable number.

20130223961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20130223961 is an equidigital number, since it uses as much as digits as its factorization.

20130223961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The spelling of 20130223961 in words is "twenty billion, one hundred thirty million, two hundred twenty-three thousand, nine hundred sixty-one".