1201567681 has 4 divisors (see below), whose sum is σ = 1201680832. Its totient is φ = 1201454532.

The previous prime is 1201567673. The next prime is 1201567699. The reversal of 1201567681 is 1867651021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1867651021 = 22699 ⋅82279.

It is a cyclic number.

It is not a de Polignac number, because 1201567681 - 2³ = 1201567673 is a prime.

It is a super-2 number, since 2×1201567681² = 2887529784047435522, 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 1201567681.

It is not an unprimeable number, because it can be changed into a prime (1201567651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38781 + ... + 62506.

It is an arithmetic number, because the mean of its divisors is an integer number (300420208).

Almost surely, 2^1201567681 is an apocalyptic number.

It is an amenable number.

1201567681 is a deficient number, since it is larger than the sum of its proper divisors (113151).

1201567681 is a wasteful number, since it uses less digits than its factorization.

1201567681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113150.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 1201567681 is about 34663.6362922299. The cubic root of 1201567681 is about 1063.1211204954.

The spelling of 1201567681 in words is "one billion, two hundred one million, five hundred sixty-seven thousand, six hundred eighty-one".