2051231115501 has 24 divisors (see below), whose sum is σ = 3140052761664. Its totient is φ = 1285867175040.

The previous prime is 2051231115469. The next prime is 2051231115523. The reversal of 2051231115501 is 1055111321502.

It is a happy number.

2051231115501 is a `hidden beast` number, since 2 + 0 + 5 + 12 + 31 + 115 + 501 = 666.

It is not a de Polignac number, because 2051231115501 - 2⁵ = 2051231115469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051231115301) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5977321 + ... + 6311166.

It is an arithmetic number, because the mean of its divisors is an integer number (130835531736).

Almost surely, 2^{2051231115501} is an apocalyptic number.

It is an amenable number.

2051231115501 is a deficient number, since it is larger than the sum of its proper divisors (1088821646163).

2051231115501 is a wasteful number, since it uses less digits than its factorization.

2051231115501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12289601 (or 12289598 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 2051231115501 in words is "two trillion, fifty-one billion, two hundred thirty-one million, one hundred fifteen thousand, five hundred one".