1147457491 has 4 divisors (see below), whose sum is σ = 1148723512. Its totient is φ = 1146191472.

The previous prime is 1147457411. The next prime is 1147457503. The reversal of 1147457491 is 1947547411.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1947547411 = 33811 ⋅57601.

It is a cyclic number.

It is not a de Polignac number, because 1147457491 - 2¹³ = 1147449299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1147457401) 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, 631650 + ... + 633463.

It is an arithmetic number, because the mean of its divisors is an integer number (287180878).

Almost surely, 2^1147457491 is an apocalyptic number.

1147457491 is a deficient number, since it is larger than the sum of its proper divisors (1266021).

1147457491 is an equidigital number, since it uses as much as digits as its factorization.

1147457491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1266020.

The product of its digits is 141120, while the sum is 43.

The square root of 1147457491 is about 33874.1419227115. The cubic root of 1147457491 is about 1046.9168790803.

The spelling of 1147457491 in words is "one billion, one hundred forty-seven million, four hundred fifty-seven thousand, four hundred ninety-one".