1491251 has 6 divisors (see below), whose sum is σ = 1559460. Its totient is φ = 1425908.

The previous prime is 1491247. The next prime is 1491271. The reversal of 1491251 is 1521941.

It is a happy number.

It is not a de Polignac number, because 1491251 - 2² = 1491247 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1491241) 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, 881 + ... + 1938.

It is an arithmetic number, because the mean of its divisors is an integer number (259910).

2^1491251 is an apocalyptic number.

1491251 is a deficient number, since it is larger than the sum of its proper divisors (68209).

1491251 is an equidigital number, since it uses as much as digits as its factorization.

1491251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865 (or 2842 counting only the distinct ones).

The product of its digits is 360, while the sum is 23.

The square root of 1491251 is about 1221.1678836262. The cubic root of 1491251 is about 114.2484322589.

The spelling of 1491251 in words is "one million, four hundred ninety-one thousand, two hundred fifty-one".