1951591 has 2 divisors, whose sum is σ = 1951592. Its totient is φ = 1951590.

The previous prime is 1951561. The next prime is 1951597.

1951591 is nontrivially palindromic in base 10.

It is a strong prime.

It is a palprime.

It is a cyclic number.

It is not a de Polignac number, because 1951591 - 2⁷ = 1951463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1951597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 975795 + 975796.

It is an arithmetic number, because the mean of its divisors is an integer number (975796).

2^1951591 is an apocalyptic number.

1951591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1951591 is an equidigital number, since it uses as much as digits as its factorization.

1951591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2025, while the sum is 31.

The square root of 1951591 is about 1396.9935576086. The cubic root of 1951591 is about 124.9672660953.

The spelling of 1951591 in words is "one million, nine hundred fifty-one thousand, five hundred ninety-one".