1491401807 has 4 divisors (see below), whose sum is σ = 1704459216. Its totient is φ = 1278344400.

The previous prime is 1491401803. The next prime is 1491401819. The reversal of 1491401807 is 7081041941.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7081041941 = 89 ⋅79562269.

It is a cyclic number.

It is not a de Polignac number, because 1491401807 - 2² = 1491401803 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 (1491401801) 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, 106528694 + ... + 106528707.

It is an arithmetic number, because the mean of its divisors is an integer number (426114804).

Almost surely, 2^1491401807 is an apocalyptic number.

1491401807 is a deficient number, since it is larger than the sum of its proper divisors (213057409).

1491401807 is an equidigital number, since it uses as much as digits as its factorization.

1491401807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213057408.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 1491401807 is about 38618.6717404936. The cubic root of 1491401807 is about 1142.5228336168.

The spelling of 1491401807 in words is "one billion, four hundred ninety-one million, four hundred one thousand, eight hundred seven".