1497428921 has 2 divisors, whose sum is σ = 1497428922. Its totient is φ = 1497428920.

The previous prime is 1497428917. The next prime is 1497428957. The reversal of 1497428921 is 1298247941.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1040965696 + 456463225 = 32264^2 + 21365^2 .

It is a cyclic number.

It is not a de Polignac number, because 1497428921 - 2² = 1497428917 is a prime.

It is not a weakly prime, because it can be changed into another prime (1497428321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 748714460 + 748714461.

It is an arithmetic number, because the mean of its divisors is an integer number (748714461).

Almost surely, 2^1497428921 is an apocalyptic number.

It is an amenable number.

1497428921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1497428921 is an equidigital number, since it uses as much as digits as its factorization.

1497428921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290304, while the sum is 47.

The square root of 1497428921 is about 38696.6267392909. The cubic root of 1497428921 is about 1144.0598350145.

The spelling of 1497428921 in words is "one billion, four hundred ninety-seven million, four hundred twenty-eight thousand, nine hundred twenty-one".