1154421979 has 2 divisors, whose sum is σ = 1154421980. Its totient is φ = 1154421978.

The previous prime is 1154421967. The next prime is 1154421997. The reversal of 1154421979 is 9791244511.

Together with next prime (1154421997) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1154421979 - 2⁹ = 1154421467 is a prime.

It is not a weakly prime, because it can be changed into another prime (1154401979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577210989 + 577210990.

It is an arithmetic number, because the mean of its divisors is an integer number (577210990).

Almost surely, 2^1154421979 is an apocalyptic number.

1154421979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1154421979 is an equidigital number, since it uses as much as digits as its factorization.

1154421979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 1154421979 is about 33976.7858838943. The cubic root of 1154421979 is about 1049.0306939728.

The spelling of 1154421979 in words is "one billion, one hundred fifty-four million, four hundred twenty-one thousand, nine hundred seventy-nine".