1497051991 has 16 divisors (see below), whose sum is σ = 1576986624. Its totient is φ = 1418418144.

The previous prime is 1497051973. The next prime is 1497052013. The reversal of 1497051991 is 1991507941.

It is a cyclic number.

It is not a de Polignac number, because 1497051991 - 2⁷ = 1497051863 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 (1497051791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2191536 + ... + 2192218.

It is an arithmetic number, because the mean of its divisors is an integer number (98561664).

Almost surely, 2^1497051991 is an apocalyptic number.

1497051991 is a deficient number, since it is larger than the sum of its proper divisors (79934633).

1497051991 is a wasteful number, since it uses less digits than its factorization.

1497051991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470.

The product of its (nonzero) digits is 102060, while the sum is 46.

The square root of 1497051991 is about 38691.7561116060. The cubic root of 1497051991 is about 1143.9638334268.

The spelling of 1497051991 in words is "one billion, four hundred ninety-seven million, fifty-one thousand, nine hundred ninety-one".