1097505979 has 4 divisors (see below), whose sum is σ = 1101384376. Its totient is φ = 1093627584.

The previous prime is 1097505971. The next prime is 1097505991. The reversal of 1097505979 is 9795057901.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9795057901 = 137 ⋅71496773.

It is a cyclic number.

It is not a de Polignac number, because 1097505979 - 2³ = 1097505971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1097505971) 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, 1938774 + ... + 1939339.

It is an arithmetic number, because the mean of its divisors is an integer number (275346094).

Almost surely, 2^1097505979 is an apocalyptic number.

1097505979 is a deficient number, since it is larger than the sum of its proper divisors (3878397).

1097505979 is an equidigital number, since it uses as much as digits as its factorization.

1097505979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878396.

The product of its (nonzero) digits is 893025, while the sum is 52.

The square root of 1097505979 is about 33128.6277862516. The cubic root of 1097505979 is about 1031.4993650091.

The spelling of 1097505979 in words is "one billion, ninety-seven million, five hundred five thousand, nine hundred seventy-nine".