154907993 has 2 divisors, whose sum is σ = 154907994. Its totient is φ = 154907992.

The previous prime is 154907939. The next prime is 154908037. The reversal of 154907993 is 399709451.

Together with previous prime (154907939) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127418944 + 27489049 = 11288^2 + 5243^2 .

It is a cyclic number.

It is not a de Polignac number, because 154907993 - 2²⁴ = 138130777 is a prime.

It is not a weakly prime, because it can be changed into another prime (154907903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77453996 + 77453997.

It is an arithmetic number, because the mean of its divisors is an integer number (77453997).

Almost surely, 2^154907993 is an apocalyptic number.

It is an amenable number.

154907993 is a deficient number, since it is larger than the sum of its proper divisors (1).

154907993 is an equidigital number, since it uses as much as digits as its factorization.

154907993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 154907993 is about 12446.2039594408. The cubic root of 154907993 is about 537.0622278648.

The spelling of 154907993 in words is "one hundred fifty-four million, nine hundred seven thousand, nine hundred ninety-three".