31240001 has 4 divisors (see below), whose sum is σ = 33643092. Its totient is φ = 28836912.

The previous prime is 31239977. The next prime is 31240019. The reversal of 31240001 is 10004213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10004213 = 971 ⋅10303.

It can be written as a sum of positive squares in 2 ways, for example, as 6250000 + 24990001 = 2500^2 + 4999^2 .

It is not a de Polignac number, because 31240001 - 2¹⁴ = 31223617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31240021) 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, 1201526 + ... + 1201551.

It is an arithmetic number, because the mean of its divisors is an integer number (8410773).

Almost surely, 2^31240001 is an apocalyptic number.

It is an amenable number.

31240001 is a deficient number, since it is larger than the sum of its proper divisors (2403091).

31240001 is a wasteful number, since it uses less digits than its factorization.

31240001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2403090.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 31240001 is about 5589.2755344499. The cubic root of 31240001 is about 314.9466643551.

Adding to 31240001 its reverse (10004213), we get a palindrome (41244214).

The spelling of 31240001 in words is "thirty-one million, two hundred forty thousand, one".