45138493 has 2 divisors, whose sum is σ = 45138494. Its totient is φ = 45138492.

The previous prime is 45138461. The next prime is 45138497. The reversal of 45138493 is 39483154.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36216324 + 8922169 = 6018^2 + 2987^2 .

It is a cyclic number.

It is not a de Polignac number, because 45138493 - 2⁵ = 45138461 is a prime.

It is a super-2 number, since 2×45138493² = 4074967100622098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (45138497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22569246 + 22569247.

It is an arithmetic number, because the mean of its divisors is an integer number (22569247).

Almost surely, 2^45138493 is an apocalyptic number.

It is an amenable number.

45138493 is a deficient number, since it is larger than the sum of its proper divisors (1).

45138493 is an equidigital number, since it uses as much as digits as its factorization.

45138493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 37.

The square root of 45138493 is about 6718.5186611336. The cubic root of 45138493 is about 356.0538492165.

The spelling of 45138493 in words is "forty-five million, one hundred thirty-eight thousand, four hundred ninety-three".