939490148581 has 2 divisors, whose sum is σ = 939490148582. Its totient is φ = 939490148580.

The previous prime is 939490148521. The next prime is 939490148591. The reversal of 939490148581 is 185841094939.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931869731556 + 7620417025 = 965334^2 + 87295^2 .

It is a cyclic number.

It is not a de Polignac number, because 939490148581 - 2²³ = 939481759973 is a prime.

It is a super-2 number, since 2×939490148581² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (939490148521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 469745074290 + 469745074291.

It is an arithmetic number, because the mean of its divisors is an integer number (469745074291).

Almost surely, 2^939490148581 is an apocalyptic number.

It is an amenable number.

939490148581 is a deficient number, since it is larger than the sum of its proper divisors (1).

939490148581 is an equidigital number, since it uses as much as digits as its factorization.

939490148581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 61.

The spelling of 939490148581 in words is "nine hundred thirty-nine billion, four hundred ninety million, one hundred forty-eight thousand, five hundred eighty-one".