1498279721 has 2 divisors, whose sum is σ = 1498279722. Its totient is φ = 1498279720.

The previous prime is 1498279709. The next prime is 1498279733. The reversal of 1498279721 is 1279728941.

It is a balanced prime because it is at equal distance from previous prime (1498279709) and next prime (1498279733).

It can be written as a sum of positive squares in only one way, i.e., 1254576400 + 243703321 = 35420^2 + 15611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1498279721 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1498279721.

It is not a weakly prime, because it can be changed into another prime (1498279021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 749139860 + 749139861.

It is an arithmetic number, because the mean of its divisors is an integer number (749139861).

Almost surely, 2^1498279721 is an apocalyptic number.

It is an amenable number.

1498279721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1498279721 is an equidigital number, since it uses as much as digits as its factorization.

1498279721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 50.

The square root of 1498279721 is about 38707.6183844989. The cubic root of 1498279721 is about 1144.2764689628.

The spelling of 1498279721 in words is "one billion, four hundred ninety-eight million, two hundred seventy-nine thousand, seven hundred twenty-one".