142778601 has 27 divisors (see below), whose sum is σ = 240329271. Its totient is φ = 81444384.

The previous prime is 142778599. The next prime is 142778611. The reversal of 142778601 is 106877241.

The square root of 142778601 is 11949.

It is a perfect power (a square), and thus also a powerful number.

142778601 is a `hidden beast` number, since 1 + 42 + 7 + 7 + 8 + 601 = 666.

It can be written as a sum of positive squares in only one way, i.e., 23532201 + 119246400 = 4851^2 + 10920^2 .

It is not a de Polignac number, because 142778601 - 2¹ = 142778599 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142778611) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 250645 + ... + 251213.

Almost surely, 2^142778601 is an apocalyptic number.

142778601 is the 11949-th square number.

142778601 is the 5975-th centered octagonal number.

It is an amenable number.

142778601 is a deficient number, since it is larger than the sum of its proper divisors (97550670).

142778601 is an frugal number, since it uses more digits than its factorization.

142778601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1158 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The cubic root of 142778601 is about 522.6621381233.

Multiplying 142778601 by its sum of digits (36), we get a square (5140029636 = 71694²).

The spelling of 142778601 in words is "one hundred forty-two million, seven hundred seventy-eight thousand, six hundred one".