145887649 has 2 divisors, whose sum is σ = 145887650. Its totient is φ = 145887648.

The previous prime is 145887647. The next prime is 145887673. The reversal of 145887649 is 946788541.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 103897249 + 41990400 = 10193^2 + 6480^2 .

It is a cyclic number.

It is not a de Polignac number, because 145887649 - 2¹ = 145887647 is a prime.

It is a super-2 number, since 2×145887649² = 42566412261494402, which contains 22 as substring.

Together with 145887647, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 145887596 and 145887605.

It is not a weakly prime, because it can be changed into another prime (145887647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72943824 + 72943825.

It is an arithmetic number, because the mean of its divisors is an integer number (72943825).

Almost surely, 2^145887649 is an apocalyptic number.

It is an amenable number.

145887649 is a deficient number, since it is larger than the sum of its proper divisors (1).

145887649 is an equidigital number, since it uses as much as digits as its factorization.

145887649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1935360, while the sum is 52.

The square root of 145887649 is about 12078.3959613849. The cubic root of 145887649 is about 526.4286397472.

The spelling of 145887649 in words is "one hundred forty-five million, eight hundred eighty-seven thousand, six hundred forty-nine".