145137893 has 2 divisors, whose sum is σ = 145137894. Its totient is φ = 145137892.

The previous prime is 145137871. The next prime is 145137919. The reversal of 145137893 is 398731541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140968129 + 4169764 = 11873^2 + 2042^2 .

It is a cyclic number.

It is not a de Polignac number, because 145137893 - 2¹² = 145133797 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145137893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (145137493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72568946 + 72568947.

It is an arithmetic number, because the mean of its divisors is an integer number (72568947).

Almost surely, 2^145137893 is an apocalyptic number.

It is an amenable number.

145137893 is a deficient number, since it is larger than the sum of its proper divisors (1).

145137893 is an equidigital number, since it uses as much as digits as its factorization.

145137893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 145137893 is about 12047.3189133516. The cubic root of 145137893 is about 525.5252708060.

The spelling of 145137893 in words is "one hundred forty-five million, one hundred thirty-seven thousand, eight hundred ninety-three".