7149201581 has 4 divisors (see below), whose sum is σ = 7149644832. Its totient is φ = 7148758332.

The previous prime is 7149201571. The next prime is 7149201583. The reversal of 7149201581 is 1851029417.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1851029417 = 20533 ⋅90149.

It is a cyclic number.

It is not a de Polignac number, because 7149201581 - 2⁶ = 7149201517 is a prime.

It is a super-2 number, since 2×7149201581² (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 (7149201583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196481 + ... + 230006.

It is an arithmetic number, because the mean of its divisors is an integer number (1787411208).

Almost surely, 2^7149201581 is an apocalyptic number.

It is an amenable number.

7149201581 is a deficient number, since it is larger than the sum of its proper divisors (443251).

7149201581 is a wasteful number, since it uses less digits than its factorization.

7149201581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443250.

The product of its (nonzero) digits is 20160, while the sum is 38.

The square root of 7149201581 is about 84552.9513441134. The cubic root of 7149201581 is about 1926.4268125157.

The spelling of 7149201581 in words is "seven billion, one hundred forty-nine million, two hundred one thousand, five hundred eighty-one".