7477001981 has 16 divisors (see below), whose sum is σ = 7722874368. Its totient is φ = 7234609200.

The previous prime is 7477001899. The next prime is 7477002031. The reversal of 7477001981 is 1891007747.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7477001981 is a prime.

It is a super-2 number, since 2×7477001981² (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 (7477003981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5468960 + ... + 5470326.

It is an arithmetic number, because the mean of its divisors is an integer number (482679648).

Almost surely, 2^7477001981 is an apocalyptic number.

It is an amenable number.

7477001981 is a deficient number, since it is larger than the sum of its proper divisors (245872387).

7477001981 is a wasteful number, since it uses less digits than its factorization.

7477001981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512.

The product of its (nonzero) digits is 98784, while the sum is 44.

The square root of 7477001981 is about 86469.6593089160. The cubic root of 7477001981 is about 1955.4310120395.

The spelling of 7477001981 in words is "seven billion, four hundred seventy-seven million, one thousand, nine hundred eighty-one".