2801631221 has 2 divisors, whose sum is σ = 2801631222. Its totient is φ = 2801631220.

The previous prime is 2801631193. The next prime is 2801631253. The reversal of 2801631221 is 1221361082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2549139121 + 252492100 = 50489^2 + 15890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2801631221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2801631271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1400815610 + 1400815611.

It is an arithmetic number, because the mean of its divisors is an integer number (1400815611).

Almost surely, 2^2801631221 is an apocalyptic number.

It is an amenable number.

2801631221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2801631221 is an equidigital number, since it uses as much as digits as its factorization.

2801631221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 2801631221 is about 52930.4375666780. The cubic root of 2801631221 is about 1409.7334004611.

The spelling of 2801631221 in words is "two billion, eight hundred one million, six hundred thirty-one thousand, two hundred twenty-one".