1572233981 has 2 divisors, whose sum is σ = 1572233982. Its totient is φ = 1572233980.

The previous prime is 1572233963. The next prime is 1572234019. The reversal of 1572233981 is 1893322751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1541818756 + 30415225 = 39266^2 + 5515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1572233981 is a prime.

It is a super-2 number, since 2×1572233981² = 4943839382022216722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1572233911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 786116990 + 786116991.

It is an arithmetic number, because the mean of its divisors is an integer number (786116991).

Almost surely, 2^1572233981 is an apocalyptic number.

It is an amenable number.

1572233981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1572233981 is an equidigital number, since it uses as much as digits as its factorization.

1572233981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 1572233981 is about 39651.4057884459. The cubic root of 1572233981 is about 1162.8018824579.

The spelling of 1572233981 in words is "one billion, five hundred seventy-two million, two hundred thirty-three thousand, nine hundred eighty-one".