991260151 has 6 divisors (see below), whose sum is σ = 1153098600. Its totient is φ = 849651516.

The previous prime is 991260143. The next prime is 991260161. The reversal of 991260151 is 151062199.

It is a happy number.

It is not a de Polignac number, because 991260151 - 2³ = 991260143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991260131) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10114851 + ... + 10114948.

It is an arithmetic number, because the mean of its divisors is an integer number (192183100).

Almost surely, 2^991260151 is an apocalyptic number.

991260151 is a deficient number, since it is larger than the sum of its proper divisors (161838449).

991260151 is a wasteful number, since it uses less digits than its factorization.

991260151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20229813 (or 20229806 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 34.

The square root of 991260151 is about 31484.2841906879. The cubic root of 991260151 is about 997.0781883311.

The spelling of 991260151 in words is "nine hundred ninety-one million, two hundred sixty thousand, one hundred fifty-one".