5402139781 has 2 divisors, whose sum is σ = 5402139782. Its totient is φ = 5402139780.

The previous prime is 5402139733. The next prime is 5402139797. The reversal of 5402139781 is 1879312045.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5039580100 + 362559681 = 70990^2 + 19041^2 .

It is a cyclic number.

It is not a de Polignac number, because 5402139781 - 2⁷ = 5402139653 is a prime.

It is a super-2 number, since 2×5402139781² = 58366228426925455922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5402139731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2701069890 + 2701069891.

It is an arithmetic number, because the mean of its divisors is an integer number (2701069891).

Almost surely, 2^5402139781 is an apocalyptic number.

It is an amenable number.

5402139781 is a deficient number, since it is larger than the sum of its proper divisors (1).

5402139781 is an equidigital number, since it uses as much as digits as its factorization.

5402139781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 5402139781 is about 73499.2502070599. The cubic root of 5402139781 is about 1754.6423440891.

The spelling of 5402139781 in words is "five billion, four hundred two million, one hundred thirty-nine thousand, seven hundred eighty-one".