1097981427 has 4 divisors (see below), whose sum is σ = 1463975240. Its totient is φ = 731987616.

The previous prime is 1097981411. The next prime is 1097981449. The reversal of 1097981427 is 7241897901.

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

It is not a de Polignac number, because 1097981427 - 2⁴ = 1097981411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097981407) 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, 182996902 + ... + 182996907.

It is an arithmetic number, because the mean of its divisors is an integer number (365993810).

Almost surely, 2^1097981427 is an apocalyptic number.

1097981427 is a deficient number, since it is larger than the sum of its proper divisors (365993813).

1097981427 is an equidigital number, since it uses as much as digits as its factorization.

1097981427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365993812.

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 1097981427 is about 33135.8027969748. The cubic root of 1097981427 is about 1031.6482946483.

The spelling of 1097981427 in words is "one billion, ninety-seven million, nine hundred eighty-one thousand, four hundred twenty-seven".