1097697291 has 4 divisors (see below), whose sum is σ = 1463596392. Its totient is φ = 731798192.

The previous prime is 1097697281. The next prime is 1097697311. The reversal of 1097697291 is 1927967901.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1097697291 - 2¹⁴ = 1097680907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1097697281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 182949546 + ... + 182949551.

It is an arithmetic number, because the mean of its divisors is an integer number (365899098).

Almost surely, 2^1097697291 is an apocalyptic number.

1097697291 is a deficient number, since it is larger than the sum of its proper divisors (365899101).

1097697291 is an equidigital number, since it uses as much as digits as its factorization.

1097697291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365899100.

The product of its (nonzero) digits is 428652, while the sum is 51.

The square root of 1097697291 is about 33131.5150725106. The cubic root of 1097697291 is about 1031.5592968743.

The spelling of 1097697291 in words is "one billion, ninety-seven million, six hundred ninety-seven thousand, two hundred ninety-one".