990651371 has 4 divisors (see below), whose sum is σ = 991267152. Its totient is φ = 990035592.

The previous prime is 990651349. The next prime is 990651401. The reversal of 990651371 is 173156099.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990651371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990651301) 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, 305471 + ... + 308696.

It is an arithmetic number, because the mean of its divisors is an integer number (247816788).

Almost surely, 2^990651371 is an apocalyptic number.

990651371 is a deficient number, since it is larger than the sum of its proper divisors (615781).

990651371 is a wasteful number, since it uses less digits than its factorization.

990651371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615780.

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 990651371 is about 31474.6147077291. The cubic root of 990651371 is about 996.8740288195.

The spelling of 990651371 in words is "nine hundred ninety million, six hundred fifty-one thousand, three hundred seventy-one".