1428012981 has 6 divisors (see below), whose sum is σ = 2062685430. Its totient is φ = 952008648.

The previous prime is 1428012977. The next prime is 1428012997. The reversal of 1428012981 is 1892108241.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 996412356 + 431600625 = 31566^2 + 20775^2 .

It is not a de Polignac number, because 1428012981 - 2² = 1428012977 is a prime.

It is a super-2 number, since 2×1428012981² = 4078442147809012722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1428012181) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 79334046 + ... + 79334063.

It is an arithmetic number, because the mean of its divisors is an integer number (343780905).

Almost surely, 2^1428012981 is an apocalyptic number.

It is an amenable number.

1428012981 is a deficient number, since it is larger than the sum of its proper divisors (634672449).

1428012981 is a wasteful number, since it uses less digits than its factorization.

1428012981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158668115 (or 158668112 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1428012981 is about 37789.0590118357. The cubic root of 1428012981 is about 1126.1011062248.

It can be divided in two parts, 14280 and 12981, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 1428012981 in words is "one billion, four hundred twenty-eight million, twelve thousand, nine hundred eighty-one".