31420551 has 8 divisors (see below), whose sum is σ = 42581104. Its totient is φ = 20603520.

The previous prime is 31420517. The next prime is 31420559. The reversal of 31420551 is 15502413.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 31420551 - 2¹⁴ = 31404167 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 (31420559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85666 + ... + 86031.

It is an arithmetic number, because the mean of its divisors is an integer number (5322638).

Almost surely, 2^31420551 is an apocalyptic number.

31420551 is a deficient number, since it is larger than the sum of its proper divisors (11160553).

31420551 is a wasteful number, since it uses less digits than its factorization.

31420551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171761.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 31420551 is about 5605.4037321142. The cubic root of 31420551 is about 315.5522386404.

Adding to 31420551 its reverse (15502413), we get a palindrome (46922964).

The spelling of 31420551 in words is "thirty-one million, four hundred twenty thousand, five hundred fifty-one".