147777381 has 6 divisors (see below), whose sum is σ = 213456230. Its totient is φ = 98518248.

The previous prime is 147777373. The next prime is 147777389. The reversal of 147777381 is 183777741.

It is an interprime number because it is at equal distance from previous prime (147777373) and next prime (147777389).

It can be written as a sum of positive squares in only one way, i.e., 143640225 + 4137156 = 11985^2 + 2034^2 .

It is not a de Polignac number, because 147777381 - 2³ = 147777373 is a prime.

It is a super-2 number, since 2×147777381² = 43676308670438322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (147777389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8209846 + ... + 8209863.

Almost surely, 2^147777381 is an apocalyptic number.

It is an amenable number.

147777381 is a deficient number, since it is larger than the sum of its proper divisors (65678849).

147777381 is a wasteful number, since it uses less digits than its factorization.

147777381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16419715 (or 16419712 counting only the distinct ones).

The product of its digits is 230496, while the sum is 45.

The square root of 147777381 is about 12156.3720328065. The cubic root of 147777381 is about 528.6918981141.

The spelling of 147777381 in words is "one hundred forty-seven million, seven hundred seventy-seven thousand, three hundred eighty-one".