145269997 has 4 divisors (see below), whose sum is σ = 148360896. Its totient is φ = 142179100.

The previous prime is 145269989. The next prime is 145270009. The reversal of 145269997 is 799962541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 799962541 = 7 ⋅114280363.

It is a cyclic number.

It is not a de Polignac number, because 145269997 - 2³ = 145269989 is a prime.

It is a super-2 number, since 2×145269997² = 42206744056760018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145269907) 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 3 ways as a sum of consecutive naturals, for example, 1545379 + ... + 1545472.

It is an arithmetic number, because the mean of its divisors is an integer number (37090224).

Almost surely, 2^145269997 is an apocalyptic number.

It is an amenable number.

145269997 is a deficient number, since it is larger than the sum of its proper divisors (3090899).

145269997 is an equidigital number, since it uses as much as digits as its factorization.

145269997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3090898.

The product of its digits is 1224720, while the sum is 52.

The square root of 145269997 is about 12052.8003799947. The cubic root of 145269997 is about 525.6846662068.

The spelling of 145269997 in words is "one hundred forty-five million, two hundred sixty-nine thousand, nine hundred ninety-seven".