145139977 has 4 divisors (see below), whose sum is σ = 145233936. Its totient is φ = 145046020.

The previous prime is 145139957. The next prime is 145140013. The reversal of 145139977 is 779931541.

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: 779931541 = 23 ⋅33910067.

It is a cyclic number.

It is not a de Polignac number, because 145139977 - 2²³ = 136751369 is a prime.

It is a super-2 number, since 2×145139977² = 42131225847121058, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145139957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44623 + ... + 47764.

It is an arithmetic number, because the mean of its divisors is an integer number (36308484).

Almost surely, 2^145139977 is an apocalyptic number.

It is an amenable number.

145139977 is a deficient number, since it is larger than the sum of its proper divisors (93959).

145139977 is an equidigital number, since it uses as much as digits as its factorization.

145139977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93958.

The product of its digits is 238140, while the sum is 46.

The square root of 145139977 is about 12047.4054053145. The cubic root of 145139977 is about 525.5277860909.

The spelling of 145139977 in words is "one hundred forty-five million, one hundred thirty-nine thousand, nine hundred seventy-seven".