31400069 has 4 divisors (see below), whose sum is σ = 32482860. Its totient is φ = 30317280.

The previous prime is 31400063. The next prime is 31400077. The reversal of 31400069 is 96000413.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5522500 + 25877569 = 2350^2 + 5087^2 .

It is a cyclic number.

It is not a de Polignac number, because 31400069 - 2⁴ = 31400053 is a prime.

It is a super-2 number, since 2×31400069² = 1971928666409522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31400063) 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, 541352 + ... + 541409.

It is an arithmetic number, because the mean of its divisors is an integer number (8120715).

Almost surely, 2^31400069 is an apocalyptic number.

It is an amenable number.

31400069 is a deficient number, since it is larger than the sum of its proper divisors (1082791).

31400069 is a wasteful number, since it uses less digits than its factorization.

31400069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082790.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 31400069 is about 5603.5764472344. The cubic root of 31400069 is about 315.4836577740.

The spelling of 31400069 in words is "thirty-one million, four hundred thousand, sixty-nine".