145771657 has 4 divisors (see below), whose sum is σ = 146012416. Its totient is φ = 145530900.

The previous prime is 145771643. The next prime is 145771673. The reversal of 145771657 is 756177541.

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.

It is a cyclic number.

It is not a de Polignac number, because 145771657 - 2¹⁵ = 145738889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145771627) 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, 119469 + ... + 120682.

It is an arithmetic number, because the mean of its divisors is an integer number (36503104).

Almost surely, 2^145771657 is an apocalyptic number.

It is an amenable number.

145771657 is a deficient number, since it is larger than the sum of its proper divisors (240759).

145771657 is an equidigital number, since it uses as much as digits as its factorization.

145771657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240758.

The product of its digits is 205800, while the sum is 43.

The square root of 145771657 is about 12073.5933756277. The cubic root of 145771657 is about 526.2890855509.

The spelling of 145771657 in words is "one hundred forty-five million, seven hundred seventy-one thousand, six hundred fifty-seven".