7191481157 has 16 divisors (see below), whose sum is σ = 8420573952. Its totient is φ = 6014615040.

The previous prime is 7191481127. The next prime is 7191481159. The reversal of 7191481157 is 7511841917.

It is a de Polignac number, because none of the positive numbers 2^k-7191481157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7191481159) 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, 26378 + ... + 122795.

It is an arithmetic number, because the mean of its divisors is an integer number (526285872).

Almost surely, 2^7191481157 is an apocalyptic number.

It is an amenable number.

7191481157 is a deficient number, since it is larger than the sum of its proper divisors (1229092795).

7191481157 is a wasteful number, since it uses less digits than its factorization.

7191481157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149348.

The product of its digits is 70560, while the sum is 44.

The square root of 7191481157 is about 84802.6011216637. The cubic root of 7191481157 is about 1930.2169082459.

The spelling of 7191481157 in words is "seven billion, one hundred ninety-one million, four hundred eighty-one thousand, one hundred fifty-seven".