1428025651981 has 8 divisors (see below), whose sum is σ = 1434805212960. Its totient is φ = 1421250378288.

The previous prime is 1428025651939. The next prime is 1428025651993. The reversal of 1428025651981 is 1891565208241.

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 1428025651981 - 2¹⁵ = 1428025619213 is a prime.

It is a super-2 number, since 2×1428025651981² (a number of 25 digits) 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 (1428025651681) 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, 403086 + ... + 1737391.

It is an arithmetic number, because the mean of its divisors is an integer number (179350651620).

Almost surely, 2^{1428025651981} is an apocalyptic number.

It is an amenable number.

1428025651981 is a deficient number, since it is larger than the sum of its proper divisors (6779560979).

1428025651981 is a wasteful number, since it uses less digits than its factorization.

1428025651981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143643.

The product of its (nonzero) digits is 1382400, while the sum is 52.

The spelling of 1428025651981 in words is "one trillion, four hundred twenty-eight billion, twenty-five million, six hundred fifty-one thousand, nine hundred eighty-one".