145772131 has 4 divisors (see below), whose sum is σ = 147109600. Its totient is φ = 144434664.

The previous prime is 145772113. The next prime is 145772141. The reversal of 145772131 is 131277541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145772131 - 2²³ = 137383523 is a prime.

It is a super-2 number, since 2×145772131² = 42499028352562322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 145772093 and 145772102.

It is not an unprimeable number, because it can be changed into a prime (145772111) 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, 668571 + ... + 668788.

It is an arithmetic number, because the mean of its divisors is an integer number (36777400).

Almost surely, 2^145772131 is an apocalyptic number.

145772131 is a deficient number, since it is larger than the sum of its proper divisors (1337469).

145772131 is a wasteful number, since it uses less digits than its factorization.

145772131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337468.

The product of its digits is 5880, while the sum is 31.

The square root of 145772131 is about 12073.6130052276. The cubic root of 145772131 is about 526.2896559882.

The spelling of 145772131 in words is "one hundred forty-five million, seven hundred seventy-two thousand, one hundred thirty-one".