731478091 has 4 divisors (see below), whose sum is σ = 774506232. Its totient is φ = 688449952.

The previous prime is 731478079. The next prime is 731478119. The reversal of 731478091 is 190874137.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 731478091 - 2¹³ = 731469899 is a prime.

It is a super-2 number, since 2×731478091² = 1070120395226008562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (731478491) 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, 21514045 + ... + 21514078.

It is an arithmetic number, because the mean of its divisors is an integer number (193626558).

Almost surely, 2^731478091 is an apocalyptic number.

731478091 is a deficient number, since it is larger than the sum of its proper divisors (43028141).

731478091 is a wasteful number, since it uses less digits than its factorization.

731478091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43028140.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 731478091 is about 27045.8516412407. The cubic root of 731478091 is about 901.0186371870.

The spelling of 731478091 in words is "seven hundred thirty-one million, four hundred seventy-eight thousand, ninety-one".