145851749 has 2 divisors, whose sum is σ = 145851750. Its totient is φ = 145851748.

The previous prime is 145851731. The next prime is 145851757. The reversal of 145851749 is 947158541.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105719524 + 40132225 = 10282^2 + 6335^2 .

It is a cyclic number.

It is not a de Polignac number, because 145851749 - 2⁸ = 145851493 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145851799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72925874 + 72925875.

It is an arithmetic number, because the mean of its divisors is an integer number (72925875).

Almost surely, 2^145851749 is an apocalyptic number.

It is an amenable number.

145851749 is a deficient number, since it is larger than the sum of its proper divisors (1).

145851749 is an equidigital number, since it uses as much as digits as its factorization.

145851749 is an evil number, because the sum of its binary digits is even.

The product of its digits is 201600, while the sum is 44.

The square root of 145851749 is about 12076.9097454605. The cubic root of 145851749 is about 526.3854550575.

The spelling of 145851749 in words is "one hundred forty-five million, eight hundred fifty-one thousand, seven hundred forty-nine".