1491427213 has 2 divisors, whose sum is σ = 1491427214. Its totient is φ = 1491427212.

The previous prime is 1491427123. The next prime is 1491427253. The reversal of 1491427213 is 3127241941.

Together with previous prime (1491427123) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1003812489 + 487614724 = 31683^2 + 22082^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1491427213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1491427253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 745713606 + 745713607.

It is an arithmetic number, because the mean of its divisors is an integer number (745713607).

Almost surely, 2^1491427213 is an apocalyptic number.

It is an amenable number.

1491427213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1491427213 is an equidigital number, since it uses as much as digits as its factorization.

1491427213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 1491427213 is about 38619.0006732437. Note that the first 3 decimals coincide. The cubic root of 1491427213 is about 1142.5293211978.

The spelling of 1491427213 in words is "one billion, four hundred ninety-one million, four hundred twenty-seven thousand, two hundred thirteen".