1654761491 has 4 divisors (see below), whose sum is σ = 1669405512. Its totient is φ = 1640117472.

The previous prime is 1654761481. The next prime is 1654761497. The reversal of 1654761491 is 1941674561.

It is a happy number.

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 1654761491 - 2¹⁴ = 1654745107 is a prime.

It is a super-3 number, since 3×1654761491³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1654761497) 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, 7321841 + ... + 7322066.

It is an arithmetic number, because the mean of its divisors is an integer number (417351378).

Almost surely, 2^1654761491 is an apocalyptic number.

1654761491 is a deficient number, since it is larger than the sum of its proper divisors (14644021).

1654761491 is a wasteful number, since it uses less digits than its factorization.

1654761491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14644020.

The product of its digits is 181440, while the sum is 44.

The square root of 1654761491 is about 40678.7597033145. The cubic root of 1654761491 is about 1182.8013236547.

The spelling of 1654761491 in words is "one billion, six hundred fifty-four million, seven hundred sixty-one thousand, four hundred ninety-one".