145311890 has 16 divisors (see below), whose sum is σ = 261700632. Its totient is φ = 58093824.

The previous prime is 145311871. The next prime is 145311893. The reversal of 145311890 is 98113541.

It can be written as a sum of positive squares in 4 ways, for example, as 100140049 + 45171841 = 10007^2 + 6721^2 .

It is a super-2 number, since 2×145311890² = 42231090750744200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (145311893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29912 + ... + 34428.

Almost surely, 2^145311890 is an apocalyptic number.

145311890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

145311890 is a deficient number, since it is larger than the sum of its proper divisors (116388742).

145311890 is a wasteful number, since it uses less digits than its factorization.

145311890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7741.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 145311890 is about 12054.5381495933. The cubic root of 145311890 is about 525.7351937109.

The spelling of 145311890 in words is "one hundred forty-five million, three hundred eleven thousand, eight hundred ninety".