1297420691 has 8 divisors (see below), whose sum is σ = 1490450784. Its totient is φ = 1106311680.

The previous prime is 1297420673. The next prime is 1297420693. The reversal of 1297420691 is 1960247921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1297420691 - 2¹⁴ = 1297404307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1297420693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478820 + ... + 481521.

It is an arithmetic number, because the mean of its divisors is an integer number (186306348).

Almost surely, 2^1297420691 is an apocalyptic number.

1297420691 is a deficient number, since it is larger than the sum of its proper divisors (193030093).

1297420691 is an equidigital number, since it uses as much as digits as its factorization.

1297420691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960541.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 1297420691 is about 36019.7264148411. The cubic root of 1297420691 is about 1090.6706001640.

The spelling of 1297420691 in words is "one billion, two hundred ninety-seven million, four hundred twenty thousand, six hundred ninety-one".