1242064591 has 16 divisors (see below), whose sum is σ = 1325237760. Its totient is φ = 1160058240.

The previous prime is 1242064583. The next prime is 1242064601. The reversal of 1242064591 is 1954602421.

It is not a de Polignac number, because 1242064591 - 2³ = 1242064583 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 (1242064501) 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, 1727130 + ... + 1727848.

It is an arithmetic number, because the mean of its divisors is an integer number (82827360).

Almost surely, 2^1242064591 is an apocalyptic number.

1242064591 is a deficient number, since it is larger than the sum of its proper divisors (83173169).

1242064591 is a wasteful number, since it uses less digits than its factorization.

1242064591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1374.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1242064591 is about 35242.9367533411. The cubic root of 1242064591 is about 1074.9329948501.

The spelling of 1242064591 in words is "one billion, two hundred forty-two million, sixty-four thousand, five hundred ninety-one".