1481259721 has 2 divisors, whose sum is σ = 1481259722. Its totient is φ = 1481259720.

The previous prime is 1481259719. The next prime is 1481259727. The reversal of 1481259721 is 1279521841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1468039225 + 13220496 = 38315^2 + 3636^2 .

It is a cyclic number.

It is not a de Polignac number, because 1481259721 - 2¹ = 1481259719 is a prime.

It is a super-2 number, since 2×1481259721² = 4388260722113995682, which contains 22 as substring.

Together with 1481259719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1481259727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 740629860 + 740629861.

It is an arithmetic number, because the mean of its divisors is an integer number (740629861).

Almost surely, 2^1481259721 is an apocalyptic number.

It is an amenable number.

1481259721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1481259721 is an equidigital number, since it uses as much as digits as its factorization.

1481259721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 40.

The square root of 1481259721 is about 38487.1370850054. The cubic root of 1481259721 is about 1139.9270808494.

The spelling of 1481259721 in words is "one billion, four hundred eighty-one million, two hundred fifty-nine thousand, seven hundred twenty-one".