7442453981 has 4 divisors (see below), whose sum is σ = 7460651100. Its totient is φ = 7424256864.

The previous prime is 7442453969. The next prime is 7442453983. The reversal of 7442453981 is 1893542447.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1893542447 = 11927 ⋅158761.

It can be written as a sum of positive squares in 2 ways, for example, as 5645117956 + 1797336025 = 75134^2 + 42395^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7442453981 is a prime.

It is a super-2 number, since 2×7442453981² (a number of 21 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 (7442453983) 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, 9097946 + ... + 9098763.

It is an arithmetic number, because the mean of its divisors is an integer number (1865162775).

Almost surely, 2^7442453981 is an apocalyptic number.

It is an amenable number.

7442453981 is a deficient number, since it is larger than the sum of its proper divisors (18197119).

7442453981 is a wasteful number, since it uses less digits than its factorization.

7442453981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18197118.

The product of its digits is 967680, while the sum is 47.

The square root of 7442453981 is about 86269.6585190877. The cubic root of 7442453981 is about 1952.4146271260.

The spelling of 7442453981 in words is "seven billion, four hundred forty-two million, four hundred fifty-three thousand, nine hundred eighty-one".