2149899281 has 2 divisors, whose sum is σ = 2149899282. Its totient is φ = 2149899280.

The previous prime is 2149899233. The next prime is 2149899313. The reversal of 2149899281 is 1829989412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1838694400 + 311204881 = 42880^2 + 17641^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149899281 - 2³⁰ = 1076157457 is a prime.

It is a super-2 number, since 2×2149899281² = 9244133836888633922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2149899181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1074949640 + 1074949641.

It is an arithmetic number, because the mean of its divisors is an integer number (1074949641).

Almost surely, 2^2149899281 is an apocalyptic number.

It is an amenable number.

2149899281 is a deficient number, since it is larger than the sum of its proper divisors (1).

2149899281 is an equidigital number, since it uses as much as digits as its factorization.

2149899281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 53.

The square root of 2149899281 is about 46367.0063838501. The cubic root of 2149899281 is about 1290.6427262082.

The spelling of 2149899281 in words is "two billion, one hundred forty-nine million, eight hundred ninety-nine thousand, two hundred eighty-one".