742681409 has 2 divisors, whose sum is σ = 742681410. Its totient is φ = 742681408.

The previous prime is 742681393. The next prime is 742681441. The reversal of 742681409 is 904186247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 555073600 + 187607809 = 23560^2 + 13697^2 .

It is a cyclic number.

It is not a de Polignac number, because 742681409 - 2⁴ = 742681393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (742684409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 371340704 + 371340705.

It is an arithmetic number, because the mean of its divisors is an integer number (371340705).

Almost surely, 2^742681409 is an apocalyptic number.

It is an amenable number.

742681409 is a deficient number, since it is larger than the sum of its proper divisors (1).

742681409 is an equidigital number, since it uses as much as digits as its factorization.

742681409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 742681409 is about 27252.1817291754. The cubic root of 742681409 is about 905.5953507636.

The spelling of 742681409 in words is "seven hundred forty-two million, six hundred eighty-one thousand, four hundred nine".