7261563981 has 8 divisors (see below), whose sum is σ = 11065240384. Its totient is φ = 4149465120.

The previous prime is 7261563971. The next prime is 7261564003. The reversal of 7261563981 is 1893651627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7261563981 - 2¹¹ = 7261561933 is a prime.

It is a super-2 number, since 2×7261563981² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7261563981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7261563901) 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, 172894360 + ... + 172894401.

It is an arithmetic number, because the mean of its divisors is an integer number (1383155048).

Almost surely, 2^7261563981 is an apocalyptic number.

It is an amenable number.

7261563981 is a deficient number, since it is larger than the sum of its proper divisors (3803676403).

7261563981 is a wasteful number, since it uses less digits than its factorization.

7261563981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345788771.

The product of its digits is 544320, while the sum is 48.

The square root of 7261563981 is about 85214.8108077463. The cubic root of 7261563981 is about 1936.4668022831.

The spelling of 7261563981 in words is "seven billion, two hundred sixty-one million, five hundred sixty-three thousand, nine hundred eighty-one".