1951001591 has 24 divisors (see below), whose sum is σ = 2485448064. Its totient is φ = 1514370480.

The previous prime is 1951001561. The next prime is 1951001597.

1951001591 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1951001591 - 2¹⁰ = 1951000567 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1951001597) 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, 134876 + ... + 148638.

It is an arithmetic number, because the mean of its divisors is an integer number (103560336).

Almost surely, 2^1951001591 is an apocalyptic number.

1951001591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1951001591 is a deficient number, since it is larger than the sum of its proper divisors (534446473).

1951001591 is a wasteful number, since it uses less digits than its factorization.

1951001591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14051 (or 14044 counting only the distinct ones).

The product of its (nonzero) digits is 2025, while the sum is 32.

The square root of 1951001591 is about 44170.1436606222. The cubic root of 1951001591 is about 1249.5468418180.

It can be divided in two parts, 195100 and 1591, that added together give a palindrome (196691).

The spelling of 1951001591 in words is "one billion, nine hundred fifty-one million, one thousand, five hundred ninety-one".