147431881 has 2 divisors, whose sum is σ = 147431882. Its totient is φ = 147431880.

The previous prime is 147431873. The next prime is 147431897. The reversal of 147431881 is 188134741.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119246400 + 28185481 = 10920^2 + 5309^2 .

It is an emirp because it is prime and its reverse (188134741) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 147431881 - 2³ = 147431873 is a prime.

It is a super-2 number, since 2×147431881² = 43472319070396322, which contains 22 as substring.

It is equal to p_8307973 and since 147431881 and 8307973 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 147431881.

It is not a weakly prime, because it can be changed into another prime (147435881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 73715940 + 73715941.

It is an arithmetic number, because the mean of its divisors is an integer number (73715941).

Almost surely, 2^147431881 is an apocalyptic number.

It is an amenable number.

147431881 is a deficient number, since it is larger than the sum of its proper divisors (1).

147431881 is an equidigital number, since it uses as much as digits as its factorization.

147431881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 37.

The square root of 147431881 is about 12142.1530627809. The cubic root of 147431881 is about 528.2795535710.

The spelling of 147431881 in words is "one hundred forty-seven million, four hundred thirty-one thousand, eight hundred eighty-one".