145869457 has 2 divisors, whose sum is σ = 145869458. Its totient is φ = 145869456.

The previous prime is 145869443. The next prime is 145869467. The reversal of 145869457 is 754968541.

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., 132503121 + 13366336 = 11511^2 + 3656^2 .

It is an emirp because it is prime and its reverse (754968541) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 145869457 - 2⁷ = 145869329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145869457.

It is not a weakly prime, because it can be changed into another prime (145869467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72934728 + 72934729.

It is an arithmetic number, because the mean of its divisors is an integer number (72934729).

Almost surely, 2^145869457 is an apocalyptic number.

It is an amenable number.

145869457 is a deficient number, since it is larger than the sum of its proper divisors (1).

145869457 is an equidigital number, since it uses as much as digits as its factorization.

145869457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1209600, while the sum is 49.

The square root of 145869457 is about 12077.6428577765. The cubic root of 145869457 is about 526.4067571821.

The spelling of 145869457 in words is "one hundred forty-five million, eight hundred sixty-nine thousand, four hundred fifty-seven".