1061572381 has 8 divisors (see below), whose sum is σ = 1065383384. Its totient is φ = 1057769280.

The previous prime is 1061572373. The next prime is 1061572387. The reversal of 1061572381 is 1832751601.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 115025625 + 946546756 = 10725^2 + 30766^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1061572381 - 2³ = 1061572373 is a prime.

It is a super-2 number, since 2×1061572381² = 2253871840204018322, 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 (1061572387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395215 + ... + 397891.

It is an arithmetic number, because the mean of its divisors is an integer number (133172923).

Almost surely, 2^1061572381 is an apocalyptic number.

It is an amenable number.

1061572381 is a deficient number, since it is larger than the sum of its proper divisors (3811003).

1061572381 is an equidigital number, since it uses as much as digits as its factorization.

1061572381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3951.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 1061572381 is about 32581.7798930629. The cubic root of 1061572381 is about 1020.1167305212.

The spelling of 1061572381 in words is "one billion, sixty-one million, five hundred seventy-two thousand, three hundred eighty-one".