153994493 has 2 divisors, whose sum is σ = 153994494. Its totient is φ = 153994492.

The previous prime is 153994459. The next prime is 153994501. The reversal of 153994493 is 394499351.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 153710404 + 284089 = 12398^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 153994493 - 2²⁰ = 152945917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (153994403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76997246 + 76997247.

It is an arithmetic number, because the mean of its divisors is an integer number (76997247).

Almost surely, 2^153994493 is an apocalyptic number.

It is an amenable number.

153994493 is a deficient number, since it is larger than the sum of its proper divisors (1).

153994493 is an equidigital number, since it uses as much as digits as its factorization.

153994493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 47.

The square root of 153994493 is about 12409.4517606541. The cubic root of 153994493 is about 536.0044518176.

The spelling of 153994493 in words is "one hundred fifty-three million, nine hundred ninety-four thousand, four hundred ninety-three".