145388691 has 12 divisors (see below), whose sum is σ = 240006832. Its totient is φ = 83079216.

The previous prime is 145388671. The next prime is 145388707. The reversal of 145388691 is 196883541.

It is not a de Polignac number, because 145388691 - 2¹⁰ = 145387667 is a prime.

It is a super-2 number, since 2×145388691² = 42275742941386962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145388611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1153816 + ... + 1153941.

Almost surely, 2^145388691 is an apocalyptic number.

145388691 is a deficient number, since it is larger than the sum of its proper divisors (94618141).

145388691 is a wasteful number, since it uses less digits than its factorization.

145388691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2307770 (or 2307767 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 145388691 is about 12057.7232925623. The cubic root of 145388691 is about 525.8277988361.

The spelling of 145388691 in words is "one hundred forty-five million, three hundred eighty-eight thousand, six hundred ninety-one".