1291951 has 4 divisors (see below), whose sum is σ = 1323504. Its totient is φ = 1260400.

The previous prime is 1291931. The next prime is 1291957. The reversal of 1291951 is 1591921.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1291951 - 2¹³ = 1283759 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 (1291957) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15715 + ... + 15796.

It is an arithmetic number, because the mean of its divisors is an integer number (330876).

2^1291951 is an apocalyptic number.

1291951 is a deficient number, since it is larger than the sum of its proper divisors (31553).

1291951 is an equidigital number, since it uses as much as digits as its factorization.

1291951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31552.

The product of its digits is 810, while the sum is 28.

The square root of 1291951 is about 1136.6402245214. The cubic root of 1291951 is about 108.9135751255.

It can be divided in two parts, 129 and 1951, that added together give a triangular number (2080 = T₆₄).

The spelling of 1291951 in words is "one million, two hundred ninety-one thousand, nine hundred fifty-one".