145771693 has 4 divisors (see below), whose sum is σ = 146586240. Its totient is φ = 144957148.

The previous prime is 145771673. The next prime is 145771711. The reversal of 145771693 is 396177541.

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: 396177541 = 331 ⋅1196911.

It is a cyclic number.

It is not a de Polignac number, because 145771693 - 2²¹ = 143674541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145771643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407005 + ... + 407362.

It is an arithmetic number, because the mean of its divisors is an integer number (36646560).

Almost surely, 2^145771693 is an apocalyptic number.

It is an amenable number.

145771693 is a deficient number, since it is larger than the sum of its proper divisors (814547).

145771693 is an equidigital number, since it uses as much as digits as its factorization.

145771693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814546.

The product of its digits is 158760, while the sum is 43.

The square root of 145771693 is about 12073.5948664845. The cubic root of 145771693 is about 526.2891288753.

The spelling of 145771693 in words is "one hundred forty-five million, seven hundred seventy-one thousand, six hundred ninety-three".