31380542 has 4 divisors (see below), whose sum is σ = 47070816. Its totient is φ = 15690270.

The previous prime is 31380541. The next prime is 31380563. The reversal of 31380542 is 24508313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24508313 = 53 ⋅462421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7845134 + ... + 7845137.

It is an arithmetic number, because the mean of its divisors is an integer number (11767704).

Almost surely, 2^31380542 is an apocalyptic number.

31380542 is a deficient number, since it is larger than the sum of its proper divisors (15690274).

31380542 is a wasteful number, since it uses less digits than its factorization.

31380542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15690273.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 31380542 is about 5601.8338068886. The cubic root of 31380542 is about 315.4182468048.

Adding to 31380542 its reverse (24508313), we get a palindrome (55888855).

The spelling of 31380542 in words is "thirty-one million, three hundred eighty thousand, five hundred forty-two".