530157781 has 16 divisors (see below), whose sum is σ = 554273280. Its totient is φ = 506746240.

The previous prime is 530157773. The next prime is 530157809. The reversal of 530157781 is 187751035.

It is a cyclic number.

It is not a de Polignac number, because 530157781 - 2³ = 530157773 is a prime.

It is a super-2 number, since 2×530157781² = 562134545509687922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 530157781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (530157701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334116 + ... + 335698.

It is an arithmetic number, because the mean of its divisors is an integer number (34642080).

Almost surely, 2^530157781 is an apocalyptic number.

It is an amenable number.

530157781 is a deficient number, since it is larger than the sum of its proper divisors (24115499).

530157781 is a wasteful number, since it uses less digits than its factorization.

530157781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796.

The product of its (nonzero) digits is 29400, while the sum is 37.

The square root of 530157781 is about 23025.1553957840. The cubic root of 530157781 is about 809.3475317740.

The spelling of 530157781 in words is "five hundred thirty million, one hundred fifty-seven thousand, seven hundred eighty-one".